1 |
/* |
/* |
2 |
* fs/tomoyo_domain.c |
* security/ccsecurity/domain.c |
3 |
* |
* |
4 |
* Implementation of the Domain-Based Mandatory Access Control. |
* Copyright (C) 2005-2010 NTT DATA CORPORATION |
5 |
* |
* |
6 |
* Copyright (C) 2005-2008 NTT DATA CORPORATION |
* Version: 1.8.0-pre 2010/09/01 |
|
* |
|
|
* Version: 1.6.5-pre 2008/10/11 |
|
7 |
* |
* |
8 |
* This file is applicable to both 2.4.30 and 2.6.11 and later. |
* This file is applicable to both 2.4.30 and 2.6.11 and later. |
9 |
* See README.ccs for ChangeLog. |
* See README.ccs for ChangeLog. |
10 |
* |
* |
11 |
*/ |
*/ |
12 |
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|
13 |
#include <linux/ccs_common.h> |
#include <linux/slab.h> |
|
#include <linux/tomoyo.h> |
|
|
#include <linux/realpath.h> |
|
14 |
#include <linux/highmem.h> |
#include <linux/highmem.h> |
15 |
#include <linux/binfmts.h> |
#include <linux/version.h> |
16 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
17 |
#include <linux/namei.h> |
#include <linux/namei.h> |
18 |
#include <linux/mount.h> |
#include <linux/mount.h> |
19 |
#endif |
#endif |
20 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30) |
21 |
/* For compatibility with older kernels. */ |
#include <linux/fs_struct.h> |
|
#ifndef for_each_process |
|
|
#define for_each_process for_each_task |
|
22 |
#endif |
#endif |
23 |
|
#include "internal.h" |
24 |
|
|
25 |
/* Variables definitions.*/ |
/* Variables definitions.*/ |
26 |
|
|
27 |
/* The initial domain. */ |
/* The global domain. */ |
28 |
struct domain_info KERNEL_DOMAIN; |
struct ccs_domain_info ccs_acl_group[CCS_MAX_ACL_GROUPS]; |
|
|
|
|
/* The list for "struct domain_info". */ |
|
|
LIST1_HEAD(domain_list); |
|
29 |
|
|
30 |
#ifdef CONFIG_TOMOYO |
/* The initial domain. */ |
31 |
|
struct ccs_domain_info ccs_kernel_domain; |
32 |
|
|
33 |
/* Domain creation lock. */ |
/* The list for "struct ccs_domain_info". */ |
34 |
static DEFINE_MUTEX(domain_list_lock); |
LIST_HEAD(ccs_domain_list); |
|
|
|
|
/* Structure for "initialize_domain" and "no_initialize_domain" keyword. */ |
|
|
struct domain_initializer_entry { |
|
|
struct list1_head list; |
|
|
const struct path_info *domainname; /* This may be NULL */ |
|
|
const struct path_info *program; |
|
|
bool is_deleted; |
|
|
bool is_not; /* True if this entry is "no_initialize_domain". */ |
|
|
bool is_last_name; /* True if the domainname is ccs_get_last_name(). */ |
|
|
}; |
|
|
|
|
|
/* Structure for "keep_domain" and "no_keep_domain" keyword. */ |
|
|
struct domain_keeper_entry { |
|
|
struct list1_head list; |
|
|
const struct path_info *domainname; |
|
|
const struct path_info *program; /* This may be NULL */ |
|
|
bool is_deleted; |
|
|
bool is_not; /* True if this entry is "no_keep_domain". */ |
|
|
bool is_last_name; /* True if the domainname is ccs_get_last_name(). */ |
|
|
}; |
|
|
|
|
|
/* Structure for "aggregator" keyword. */ |
|
|
struct aggregator_entry { |
|
|
struct list1_head list; |
|
|
const struct path_info *original_name; |
|
|
const struct path_info *aggregated_name; |
|
|
bool is_deleted; |
|
|
}; |
|
|
|
|
|
/* Structure for "alias" keyword. */ |
|
|
struct alias_entry { |
|
|
struct list1_head list; |
|
|
const struct path_info *original_name; |
|
|
const struct path_info *aliased_name; |
|
|
bool is_deleted; |
|
|
}; |
|
35 |
|
|
36 |
/** |
struct list_head ccs_policy_list[CCS_MAX_POLICY]; |
37 |
* ccs_set_domain_flag - Set or clear domain's attribute flags. |
struct list_head ccs_group_list[CCS_MAX_GROUP]; |
38 |
* |
struct list_head ccs_shared_list[CCS_MAX_LIST]; |
|
* @domain: Pointer to "struct domain_info". |
|
|
* @is_delete: True if it is a delete request. |
|
|
* @flags: Flags to set or clear. |
|
|
* |
|
|
* Returns nothing. |
|
|
*/ |
|
|
void ccs_set_domain_flag(struct domain_info *domain, const bool is_delete, |
|
|
const u8 flags) |
|
|
{ |
|
|
/* We need to serialize because this is bitfield operation. */ |
|
|
static DEFINE_SPINLOCK(lock); |
|
|
/***** CRITICAL SECTION START *****/ |
|
|
spin_lock(&lock); |
|
|
if (!is_delete) |
|
|
domain->flags |= flags; |
|
|
else |
|
|
domain->flags &= ~flags; |
|
|
spin_unlock(&lock); |
|
|
/***** CRITICAL SECTION END *****/ |
|
|
} |
|
39 |
|
|
40 |
/** |
/** |
41 |
* ccs_get_last_name - Get last component of a domainname. |
* ccs_update_policy - Update an entry for exception policy. |
|
* |
|
|
* @domain: Pointer to "struct domain_info". |
|
42 |
* |
* |
43 |
* Returns the last component of the domainname. |
* @new_entry: Pointer to "struct ccs_acl_info". |
44 |
*/ |
* @size: Size of @new_entry in bytes. |
45 |
const char *ccs_get_last_name(const struct domain_info *domain) |
* @is_delete: True if it is a delete request. |
46 |
{ |
* @list: Pointer to "struct list_head". |
47 |
const char *cp0 = domain->domainname->name; |
* @check_duplicate: Callback function to find duplicated entry. |
|
const char *cp1 = strrchr(cp0, ' '); |
|
|
if (cp1) |
|
|
return cp1 + 1; |
|
|
return cp0; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_add_domain_acl - Add the given ACL to the given domain. |
|
48 |
* |
* |
49 |
* @domain: Pointer to "struct domain_info". May be NULL. |
* Returns 0 on success, negative value otherwise. |
|
* @acl: Pointer to "struct acl_info". |
|
50 |
* |
* |
51 |
* Returns 0. |
* Caller holds ccs_read_lock(). |
52 |
*/ |
*/ |
53 |
int ccs_add_domain_acl(struct domain_info *domain, struct acl_info *acl) |
int ccs_update_policy(struct ccs_acl_head *new_entry, const int size, |
54 |
{ |
bool is_delete, struct list_head *list, |
55 |
if (domain) { |
bool (*check_duplicate) (const struct ccs_acl_head *, |
56 |
/* |
const struct ccs_acl_head *)) |
57 |
* We need to serialize because this function is called by |
{ |
58 |
* various update functions. |
int error = is_delete ? -ENOENT : -ENOMEM; |
59 |
*/ |
struct ccs_acl_head *entry; |
60 |
static DEFINE_SPINLOCK(lock); |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
61 |
/***** CRITICAL SECTION START *****/ |
return -ENOMEM; |
62 |
spin_lock(&lock); |
list_for_each_entry_rcu(entry, list, list) { |
63 |
list1_add_tail_mb(&acl->list, &domain->acl_info_list); |
if (!check_duplicate(entry, new_entry)) |
64 |
spin_unlock(&lock); |
continue; |
65 |
/***** CRITICAL SECTION END *****/ |
entry->is_deleted = is_delete; |
66 |
} else { |
error = 0; |
67 |
acl->type &= ~ACL_DELETED; |
break; |
68 |
} |
} |
69 |
ccs_update_counter(CCS_UPDATES_COUNTER_DOMAIN_POLICY); |
if (error && !is_delete) { |
70 |
return 0; |
entry = ccs_commit_ok(new_entry, size); |
71 |
|
if (entry) { |
72 |
|
list_add_tail_rcu(&entry->list, list); |
73 |
|
error = 0; |
74 |
|
} |
75 |
|
} |
76 |
|
mutex_unlock(&ccs_policy_lock); |
77 |
|
return error; |
78 |
} |
} |
79 |
|
|
80 |
/** |
static inline bool ccs_same_acl_head(const struct ccs_acl_info *p1, |
81 |
* ccs_del_domain_acl - Delete the given ACL from the domain. |
const struct ccs_acl_info *p2) |
|
* |
|
|
* @acl: Pointer to "struct acl_info". May be NULL. |
|
|
* |
|
|
* Returns 0. |
|
|
*/ |
|
|
int ccs_del_domain_acl(struct acl_info *acl) |
|
82 |
{ |
{ |
83 |
if (acl) |
return p1->type == p2->type && p1->cond == p2->cond; |
|
acl->type |= ACL_DELETED; |
|
|
ccs_update_counter(CCS_UPDATES_COUNTER_DOMAIN_POLICY); |
|
|
return 0; |
|
84 |
} |
} |
85 |
|
|
86 |
/** |
/** |
87 |
* audit_execute_handler_log - Audit execute_handler log. |
* ccs_update_domain - Update an entry for domain policy. |
88 |
* |
* |
89 |
* @is_default: True if it is "execute_handler" log. |
* @new_entry: Pointer to "struct ccs_acl_info". |
90 |
* @handler: The realpath of the handler. |
* @size: Size of @new_entry in bytes. |
91 |
* @bprm: Pointer to "struct linux_binprm". |
* @param: Pointer to "struct ccs_acl_param". |
92 |
|
* @check_duplicate: Callback function to find duplicated entry. |
93 |
|
* @merge_duplicate: Callback function to merge duplicated entry. Maybe NULL. |
94 |
* |
* |
95 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
|
*/ |
|
|
static int audit_execute_handler_log(const bool is_default, |
|
|
const char *handler, |
|
|
struct linux_binprm *bprm) |
|
|
{ |
|
|
struct ccs_request_info r; |
|
|
ccs_init_request_info(&r, NULL, CCS_TOMOYO_MAC_FOR_FILE); |
|
|
r.bprm = bprm; |
|
|
return ccs_write_audit_log(true, &r, "%s %s\n", |
|
|
is_default ? KEYWORD_EXECUTE_HANDLER : |
|
|
KEYWORD_DENIED_EXECUTE_HANDLER, handler); |
|
|
} |
|
|
|
|
|
/** |
|
|
* audit_domain_creation_log - Audit domain creation log. |
|
96 |
* |
* |
97 |
* @domain: Pointer to "struct domain_info". |
* Caller holds ccs_read_lock(). |
|
* |
|
|
* Returns 0 on success, negative value otherwise. |
|
98 |
*/ |
*/ |
99 |
static int audit_domain_creation_log(struct domain_info *domain) |
int ccs_update_domain(struct ccs_acl_info *new_entry, const int size, |
100 |
{ |
struct ccs_acl_param *param, |
101 |
struct ccs_request_info r; |
bool (*check_duplicate) (const struct ccs_acl_info *, |
102 |
ccs_init_request_info(&r, domain, CCS_TOMOYO_MAC_FOR_FILE); |
const struct ccs_acl_info *), |
103 |
return ccs_write_audit_log(false, &r, "use_profile %u\n", r.profile); |
bool (*merge_duplicate) (struct ccs_acl_info *, |
104 |
} |
struct ccs_acl_info *, |
105 |
|
const bool)) |
106 |
/* The list for "struct domain_initializer_entry". */ |
{ |
107 |
static LIST1_HEAD(domain_initializer_list); |
int error = param->is_delete ? -ENOENT : -ENOMEM; |
108 |
|
struct ccs_acl_info *entry; |
109 |
/** |
const u8 type = new_entry->type; |
110 |
* update_domain_initializer_entry - Update "struct domain_initializer_entry" list. |
const u8 i = type == CCS_TYPE_AUTO_EXECUTE_HANDLER || |
111 |
* |
type == CCS_TYPE_DENIED_EXECUTE_HANDLER || |
112 |
* @domainname: The name of domain. May be NULL. |
type == CCS_TYPE_AUTO_TASK_ACL; |
113 |
* @program: The name of program. |
const bool is_delete = param->is_delete; |
114 |
* @is_not: True if it is "no_initialize_domain" entry. |
struct ccs_domain_info * const domain = param->domain; |
115 |
* @is_delete: True if it is a delete request. |
if (param->data[0]) { |
116 |
* |
new_entry->cond = ccs_get_condition(param->data); |
117 |
* Returns 0 on success, negative value otherwise. |
if (!new_entry->cond) |
|
*/ |
|
|
static int update_domain_initializer_entry(const char *domainname, |
|
|
const char *program, |
|
|
const bool is_not, |
|
|
const bool is_delete) |
|
|
{ |
|
|
struct domain_initializer_entry *new_entry; |
|
|
struct domain_initializer_entry *ptr; |
|
|
static DEFINE_MUTEX(lock); |
|
|
const struct path_info *saved_program; |
|
|
const struct path_info *saved_domainname = NULL; |
|
|
int error = -ENOMEM; |
|
|
bool is_last_name = false; |
|
|
if (!ccs_is_correct_path(program, 1, -1, -1, __func__)) |
|
|
return -EINVAL; /* No patterns allowed. */ |
|
|
if (domainname) { |
|
|
if (!ccs_is_domain_def(domainname) && |
|
|
ccs_is_correct_path(domainname, 1, -1, -1, __func__)) |
|
|
is_last_name = true; |
|
|
else if (!ccs_is_correct_domain(domainname, __func__)) |
|
118 |
return -EINVAL; |
return -EINVAL; |
|
saved_domainname = ccs_save_name(domainname); |
|
|
if (!saved_domainname) |
|
|
return -ENOMEM; |
|
119 |
} |
} |
120 |
saved_program = ccs_save_name(program); |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
|
if (!saved_program) |
|
|
return -ENOMEM; |
|
|
mutex_lock(&lock); |
|
|
list1_for_each_entry(ptr, &domain_initializer_list, list) { |
|
|
if (ptr->is_not != is_not || |
|
|
ptr->domainname != saved_domainname || |
|
|
ptr->program != saved_program) |
|
|
continue; |
|
|
ptr->is_deleted = is_delete; |
|
|
error = 0; |
|
121 |
goto out; |
goto out; |
122 |
|
list_for_each_entry_rcu(entry, &domain->acl_info_list[i], list) { |
123 |
|
if (!ccs_same_acl_head(entry, new_entry) || |
124 |
|
!check_duplicate(entry, new_entry)) |
125 |
|
continue; |
126 |
|
if (merge_duplicate) |
127 |
|
entry->is_deleted = merge_duplicate(entry, new_entry, |
128 |
|
is_delete); |
129 |
|
else |
130 |
|
entry->is_deleted = is_delete; |
131 |
|
error = 0; |
132 |
|
break; |
133 |
} |
} |
134 |
if (is_delete) { |
if (error && !is_delete) { |
135 |
error = -ENOENT; |
entry = ccs_commit_ok(new_entry, size); |
136 |
goto out; |
if (entry) { |
137 |
|
list_add_tail_rcu(&entry->list, |
138 |
|
&domain->acl_info_list[i]); |
139 |
|
error = 0; |
140 |
|
} |
141 |
} |
} |
142 |
new_entry = ccs_alloc_element(sizeof(*new_entry)); |
mutex_unlock(&ccs_policy_lock); |
|
if (!new_entry) |
|
|
goto out; |
|
|
new_entry->domainname = saved_domainname; |
|
|
new_entry->program = saved_program; |
|
|
new_entry->is_not = is_not; |
|
|
new_entry->is_last_name = is_last_name; |
|
|
list1_add_tail_mb(&new_entry->list, &domain_initializer_list); |
|
|
error = 0; |
|
143 |
out: |
out: |
144 |
mutex_unlock(&lock); |
ccs_put_condition(new_entry->cond); |
|
ccs_update_counter(CCS_UPDATES_COUNTER_EXCEPTION_POLICY); |
|
145 |
return error; |
return error; |
146 |
} |
} |
147 |
|
|
148 |
/** |
void ccs_check_acl(struct ccs_request_info *r, |
149 |
* ccs_read_domain_initializer_policy - Read "struct domain_initializer_entry" list. |
bool (*check_entry) (struct ccs_request_info *, |
150 |
* |
const struct ccs_acl_info *)) |
151 |
* @head: Pointer to "struct ccs_io_buffer". |
{ |
152 |
* |
const struct ccs_domain_info *domain = ccs_current_domain(); |
153 |
* Returns true on success, false otherwise. |
struct ccs_acl_info *ptr; |
154 |
*/ |
bool retried = false; |
155 |
bool ccs_read_domain_initializer_policy(struct ccs_io_buffer *head) |
const u8 i = !check_entry; |
156 |
{ |
retry: |
157 |
struct list1_head *pos; |
list_for_each_entry_rcu(ptr, &domain->acl_info_list[i], list) { |
|
list1_for_each_cookie(pos, head->read_var2, &domain_initializer_list) { |
|
|
const char *no; |
|
|
const char *from = ""; |
|
|
const char *domain = ""; |
|
|
struct domain_initializer_entry *ptr; |
|
|
ptr = list1_entry(pos, struct domain_initializer_entry, list); |
|
158 |
if (ptr->is_deleted) |
if (ptr->is_deleted) |
159 |
continue; |
continue; |
160 |
no = ptr->is_not ? "no_" : ""; |
if (ptr->type != r->param_type) |
|
if (ptr->domainname) { |
|
|
from = " from "; |
|
|
domain = ptr->domainname->name; |
|
|
} |
|
|
if (!ccs_io_printf(head, |
|
|
"%s" KEYWORD_INITIALIZE_DOMAIN "%s%s%s\n", |
|
|
no, ptr->program->name, from, domain)) |
|
|
goto out; |
|
|
} |
|
|
return true; |
|
|
out: |
|
|
return false; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_write_domain_initializer_policy - Write "struct domain_initializer_entry" list. |
|
|
* |
|
|
* @data: String to parse. |
|
|
* @is_not: True if it is "no_initialize_domain" entry. |
|
|
* @is_delete: True if it is a delete request. |
|
|
* |
|
|
* Returns 0 on success, negative value otherwise. |
|
|
*/ |
|
|
int ccs_write_domain_initializer_policy(char *data, const bool is_not, |
|
|
const bool is_delete) |
|
|
{ |
|
|
char *cp = strstr(data, " from "); |
|
|
if (cp) { |
|
|
*cp = '\0'; |
|
|
return update_domain_initializer_entry(cp + 6, data, is_not, |
|
|
is_delete); |
|
|
} |
|
|
return update_domain_initializer_entry(NULL, data, is_not, is_delete); |
|
|
} |
|
|
|
|
|
/** |
|
|
* is_domain_initializer - Check whether the given program causes domainname reinitialization. |
|
|
* |
|
|
* @domainname: The name of domain. |
|
|
* @program: The name of program. |
|
|
* @last_name: The last component of @domainname. |
|
|
* |
|
|
* Returns true if executing @program reinitializes domain transition, |
|
|
* false otherwise. |
|
|
*/ |
|
|
static bool is_domain_initializer(const struct path_info *domainname, |
|
|
const struct path_info *program, |
|
|
const struct path_info *last_name) |
|
|
{ |
|
|
struct domain_initializer_entry *ptr; |
|
|
bool flag = false; |
|
|
list1_for_each_entry(ptr, &domain_initializer_list, list) { |
|
|
if (ptr->is_deleted) |
|
161 |
continue; |
continue; |
162 |
if (ptr->domainname) { |
if (check_entry && !check_entry(r, ptr)) |
|
if (!ptr->is_last_name) { |
|
|
if (ptr->domainname != domainname) |
|
|
continue; |
|
|
} else { |
|
|
if (ccs_pathcmp(ptr->domainname, last_name)) |
|
|
continue; |
|
|
} |
|
|
} |
|
|
if (ccs_pathcmp(ptr->program, program)) |
|
163 |
continue; |
continue; |
164 |
if (ptr->is_not) |
if (!ccs_condition(r, ptr->cond)) |
165 |
return false; |
continue; |
166 |
flag = true; |
r->matched_acl = ptr; |
167 |
|
r->granted = true; |
168 |
|
return; |
169 |
|
} |
170 |
|
if (!retried) { |
171 |
|
retried = true; |
172 |
|
domain = &ccs_acl_group[domain->group]; |
173 |
|
goto retry; |
174 |
} |
} |
175 |
return flag; |
r->granted = false; |
176 |
} |
} |
177 |
|
|
178 |
/* The list for "struct domain_keeper_entry". */ |
static bool ccs_same_transition_control(const struct ccs_acl_head *a, |
179 |
static LIST1_HEAD(domain_keeper_list); |
const struct ccs_acl_head *b) |
180 |
|
{ |
181 |
|
const struct ccs_transition_control *p1 = container_of(a, typeof(*p1), |
182 |
|
head); |
183 |
|
const struct ccs_transition_control *p2 = container_of(b, typeof(*p2), |
184 |
|
head); |
185 |
|
return p1->type == p2->type && p1->is_last_name == p2->is_last_name |
186 |
|
&& p1->domainname == p2->domainname |
187 |
|
&& p1->program == p2->program; |
188 |
|
} |
189 |
|
|
190 |
/** |
/** |
191 |
* update_domain_keeper_entry - Update "struct domain_keeper_entry" list. |
* ccs_update_transition_control_entry - Update "struct ccs_transition_control" list. |
192 |
* |
* |
193 |
* @domainname: The name of domain. |
* @domainname: The name of domain. Maybe NULL. |
194 |
* @program: The name of program. May be NULL. |
* @program: The name of program. Maybe NULL. |
195 |
* @is_not: True if it is "no_keep_domain" entry. |
* @type: Type of transition. |
196 |
* @is_delete: True if it is a delete request. |
* @is_delete: True if it is a delete request. |
197 |
* |
* |
198 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
199 |
*/ |
*/ |
200 |
static int update_domain_keeper_entry(const char *domainname, |
static int ccs_update_transition_control_entry(const char *domainname, |
201 |
const char *program, |
const char *program, |
202 |
const bool is_not, const bool is_delete) |
const u8 type, |
203 |
{ |
const bool is_delete) |
204 |
struct domain_keeper_entry *new_entry; |
{ |
205 |
struct domain_keeper_entry *ptr; |
struct ccs_transition_control e = { .type = type }; |
206 |
const struct path_info *saved_domainname; |
int error = is_delete ? -ENOENT : -ENOMEM; |
207 |
const struct path_info *saved_program = NULL; |
if (program && strcmp(program, "any")) { |
208 |
static DEFINE_MUTEX(lock); |
if (!ccs_correct_path(program)) |
|
int error = -ENOMEM; |
|
|
bool is_last_name = false; |
|
|
if (!ccs_is_domain_def(domainname) && |
|
|
ccs_is_correct_path(domainname, 1, -1, -1, __func__)) |
|
|
is_last_name = true; |
|
|
else if (!ccs_is_correct_domain(domainname, __func__)) |
|
|
return -EINVAL; |
|
|
if (program) { |
|
|
if (!ccs_is_correct_path(program, 1, -1, -1, __func__)) |
|
209 |
return -EINVAL; |
return -EINVAL; |
210 |
saved_program = ccs_save_name(program); |
e.program = ccs_get_name(program); |
211 |
if (!saved_program) |
if (!e.program) |
212 |
return -ENOMEM; |
goto out; |
|
} |
|
|
saved_domainname = ccs_save_name(domainname); |
|
|
if (!saved_domainname) |
|
|
return -ENOMEM; |
|
|
mutex_lock(&lock); |
|
|
list1_for_each_entry(ptr, &domain_keeper_list, list) { |
|
|
if (ptr->is_not != is_not || |
|
|
ptr->domainname != saved_domainname || |
|
|
ptr->program != saved_program) |
|
|
continue; |
|
|
ptr->is_deleted = is_delete; |
|
|
error = 0; |
|
|
goto out; |
|
213 |
} |
} |
214 |
if (is_delete) { |
if (domainname && strcmp(domainname, "any")) { |
215 |
error = -ENOENT; |
if (!ccs_correct_domain(domainname)) { |
216 |
goto out; |
if (!ccs_correct_path(domainname)) |
217 |
|
goto out; |
218 |
|
e.is_last_name = true; |
219 |
|
} |
220 |
|
e.domainname = ccs_get_name(domainname); |
221 |
|
if (!e.domainname) |
222 |
|
goto out; |
223 |
} |
} |
224 |
new_entry = ccs_alloc_element(sizeof(*new_entry)); |
error = ccs_update_policy(&e.head, sizeof(e), is_delete, |
225 |
if (!new_entry) |
&ccs_policy_list[CCS_ID_TRANSITION_CONTROL], |
226 |
goto out; |
ccs_same_transition_control); |
|
new_entry->domainname = saved_domainname; |
|
|
new_entry->program = saved_program; |
|
|
new_entry->is_not = is_not; |
|
|
new_entry->is_last_name = is_last_name; |
|
|
list1_add_tail_mb(&new_entry->list, &domain_keeper_list); |
|
|
error = 0; |
|
227 |
out: |
out: |
228 |
mutex_unlock(&lock); |
ccs_put_name(e.domainname); |
229 |
ccs_update_counter(CCS_UPDATES_COUNTER_EXCEPTION_POLICY); |
ccs_put_name(e.program); |
230 |
return error; |
return error; |
231 |
} |
} |
232 |
|
|
233 |
/** |
/** |
234 |
* ccs_write_domain_keeper_policy - Write "struct domain_keeper_entry" list. |
* ccs_write_transition_control - Write "struct ccs_transition_control" list. |
235 |
* |
* |
236 |
* @data: String to parse. |
* @data: String to parse. |
|
* @is_not: True if it is "no_keep_domain" entry. |
|
237 |
* @is_delete: True if it is a delete request. |
* @is_delete: True if it is a delete request. |
238 |
|
* @type: Type of this entry. |
239 |
* |
* |
240 |
|
* Returns 0 on success, negative value otherwise. |
241 |
*/ |
*/ |
242 |
int ccs_write_domain_keeper_policy(char *data, const bool is_not, |
int ccs_write_transition_control(char *data, const bool is_delete, |
243 |
const bool is_delete) |
const u8 type) |
|
{ |
|
|
char *cp = strstr(data, " from "); |
|
|
if (cp) { |
|
|
*cp = '\0'; |
|
|
return update_domain_keeper_entry(cp + 6, data, |
|
|
is_not, is_delete); |
|
|
} |
|
|
return update_domain_keeper_entry(data, NULL, is_not, is_delete); |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_read_domain_keeper_policy - Read "struct domain_keeper_entry" list. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* |
|
|
* Returns true on success, false otherwise. |
|
|
*/ |
|
|
bool ccs_read_domain_keeper_policy(struct ccs_io_buffer *head) |
|
244 |
{ |
{ |
245 |
struct list1_head *pos; |
char *domainname = strstr(data, " from "); |
246 |
list1_for_each_cookie(pos, head->read_var2, &domain_keeper_list) { |
if (domainname) { |
247 |
struct domain_keeper_entry *ptr; |
*domainname = '\0'; |
248 |
const char *no; |
domainname += 6; |
249 |
const char *from = ""; |
} else if (type == CCS_TRANSITION_CONTROL_NO_KEEP || |
250 |
const char *program = ""; |
type == CCS_TRANSITION_CONTROL_KEEP) { |
251 |
ptr = list1_entry(pos, struct domain_keeper_entry, list); |
domainname = data; |
252 |
if (ptr->is_deleted) |
data = NULL; |
|
continue; |
|
|
no = ptr->is_not ? "no_" : ""; |
|
|
if (ptr->program) { |
|
|
from = " from "; |
|
|
program = ptr->program->name; |
|
|
} |
|
|
if (!ccs_io_printf(head, |
|
|
"%s" KEYWORD_KEEP_DOMAIN "%s%s%s\n", no, |
|
|
program, from, ptr->domainname->name)) |
|
|
goto out; |
|
253 |
} |
} |
254 |
return true; |
return ccs_update_transition_control_entry(domainname, data, type, |
255 |
out: |
is_delete); |
|
return false; |
|
256 |
} |
} |
257 |
|
|
258 |
/** |
/** |
259 |
* is_domain_keeper - Check whether the given program causes domain transition suppression. |
* ccs_transition_type - Get domain transition type. |
260 |
* |
* |
261 |
* @domainname: The name of domain. |
* @domainname: The name of domain. |
262 |
* @program: The name of program. |
* @program: The name of program. |
|
* @last_name: The last component of @domainname. |
|
263 |
* |
* |
264 |
* Returns true if executing @program supresses domain transition, |
* Returns CCS_TRANSITION_CONTROL_INITIALIZE if executing @program |
265 |
* false otherwise. |
* reinitializes domain transition, CCS_TRANSITION_CONTROL_KEEP if executing |
266 |
*/ |
* @program suppresses domain transition, others otherwise. |
267 |
static bool is_domain_keeper(const struct path_info *domainname, |
* |
268 |
const struct path_info *program, |
* Caller holds ccs_read_lock(). |
269 |
const struct path_info *last_name) |
*/ |
270 |
{ |
static u8 ccs_transition_type(const struct ccs_path_info *domainname, |
271 |
struct domain_keeper_entry *ptr; |
const struct ccs_path_info *program) |
272 |
bool flag = false; |
{ |
273 |
list1_for_each_entry(ptr, &domain_keeper_list, list) { |
const struct ccs_transition_control *ptr; |
274 |
if (ptr->is_deleted) |
const char *last_name = ccs_last_word(domainname->name); |
275 |
continue; |
u8 type; |
276 |
if (!ptr->is_last_name) { |
for (type = 0; type < CCS_MAX_TRANSITION_TYPE; type++) { |
277 |
if (ptr->domainname != domainname) |
next: |
278 |
|
list_for_each_entry_rcu(ptr, &ccs_policy_list |
279 |
|
[CCS_ID_TRANSITION_CONTROL], |
280 |
|
head.list) { |
281 |
|
if (ptr->head.is_deleted || ptr->type != type) |
282 |
continue; |
continue; |
283 |
} else { |
if (ptr->domainname) { |
284 |
if (ccs_pathcmp(ptr->domainname, last_name)) |
if (!ptr->is_last_name) { |
285 |
|
if (ptr->domainname != domainname) |
286 |
|
continue; |
287 |
|
} else { |
288 |
|
/* |
289 |
|
* Use direct strcmp() since this is |
290 |
|
* unlikely used. |
291 |
|
*/ |
292 |
|
if (strcmp(ptr->domainname->name, |
293 |
|
last_name)) |
294 |
|
continue; |
295 |
|
} |
296 |
|
} |
297 |
|
if (ptr->program && ccs_pathcmp(ptr->program, program)) |
298 |
continue; |
continue; |
299 |
|
if (type == CCS_TRANSITION_CONTROL_NO_INITIALIZE) { |
300 |
|
/* |
301 |
|
* Do not check for initialize_domain if |
302 |
|
* no_initialize_domain matched. |
303 |
|
*/ |
304 |
|
type = CCS_TRANSITION_CONTROL_NO_KEEP; |
305 |
|
goto next; |
306 |
|
} |
307 |
|
goto done; |
308 |
} |
} |
|
if (ptr->program && ccs_pathcmp(ptr->program, program)) |
|
|
continue; |
|
|
if (ptr->is_not) |
|
|
return false; |
|
|
flag = true; |
|
309 |
} |
} |
310 |
return flag; |
done: |
311 |
} |
return type; |
|
|
|
|
/* The list for "struct alias_entry". */ |
|
|
static LIST1_HEAD(alias_list); |
|
|
|
|
|
/** |
|
|
* update_alias_entry - Update "struct alias_entry" list. |
|
|
* |
|
|
* @original_name: The original program's real name. |
|
|
* @aliased_name: The symbolic program's symbolic link's name. |
|
|
* @is_delete: True if it is a delete request. |
|
|
* |
|
|
* Returns 0 on success, negative value otherwise. |
|
|
*/ |
|
|
static int update_alias_entry(const char *original_name, |
|
|
const char *aliased_name, |
|
|
const bool is_delete) |
|
|
{ |
|
|
struct alias_entry *new_entry; |
|
|
struct alias_entry *ptr; |
|
|
static DEFINE_MUTEX(lock); |
|
|
const struct path_info *saved_original_name; |
|
|
const struct path_info *saved_aliased_name; |
|
|
int error = -ENOMEM; |
|
|
if (!ccs_is_correct_path(original_name, 1, -1, -1, __func__) || |
|
|
!ccs_is_correct_path(aliased_name, 1, -1, -1, __func__)) |
|
|
return -EINVAL; /* No patterns allowed. */ |
|
|
saved_original_name = ccs_save_name(original_name); |
|
|
saved_aliased_name = ccs_save_name(aliased_name); |
|
|
if (!saved_original_name || !saved_aliased_name) |
|
|
return -ENOMEM; |
|
|
mutex_lock(&lock); |
|
|
list1_for_each_entry(ptr, &alias_list, list) { |
|
|
if (ptr->original_name != saved_original_name || |
|
|
ptr->aliased_name != saved_aliased_name) |
|
|
continue; |
|
|
ptr->is_deleted = is_delete; |
|
|
error = 0; |
|
|
goto out; |
|
|
} |
|
|
if (is_delete) { |
|
|
error = -ENOENT; |
|
|
goto out; |
|
|
} |
|
|
new_entry = ccs_alloc_element(sizeof(*new_entry)); |
|
|
if (!new_entry) |
|
|
goto out; |
|
|
new_entry->original_name = saved_original_name; |
|
|
new_entry->aliased_name = saved_aliased_name; |
|
|
list1_add_tail_mb(&new_entry->list, &alias_list); |
|
|
error = 0; |
|
|
out: |
|
|
mutex_unlock(&lock); |
|
|
ccs_update_counter(CCS_UPDATES_COUNTER_EXCEPTION_POLICY); |
|
|
return error; |
|
312 |
} |
} |
313 |
|
|
314 |
/** |
static bool ccs_same_aggregator(const struct ccs_acl_head *a, |
315 |
* ccs_read_alias_policy - Read "struct alias_entry" list. |
const struct ccs_acl_head *b) |
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* |
|
|
* Returns true on success, false otherwise. |
|
|
*/ |
|
|
bool ccs_read_alias_policy(struct ccs_io_buffer *head) |
|
316 |
{ |
{ |
317 |
struct list1_head *pos; |
const struct ccs_aggregator *p1 = container_of(a, typeof(*p1), head); |
318 |
list1_for_each_cookie(pos, head->read_var2, &alias_list) { |
const struct ccs_aggregator *p2 = container_of(b, typeof(*p2), head); |
319 |
struct alias_entry *ptr; |
return p1->original_name == p2->original_name && |
320 |
ptr = list1_entry(pos, struct alias_entry, list); |
p1->aggregated_name == p2->aggregated_name; |
|
if (ptr->is_deleted) |
|
|
continue; |
|
|
if (!ccs_io_printf(head, KEYWORD_ALIAS "%s %s\n", |
|
|
ptr->original_name->name, |
|
|
ptr->aliased_name->name)) |
|
|
goto out; |
|
|
} |
|
|
return true; |
|
|
out: |
|
|
return false; |
|
321 |
} |
} |
322 |
|
|
323 |
/** |
/** |
324 |
* ccs_write_alias_policy - Write "struct alias_entry" list. |
* ccs_update_aggregator_entry - Update "struct ccs_aggregator" list. |
|
* |
|
|
* @data: String to parse. |
|
|
* @is_delete: True if it is a delete request. |
|
|
* |
|
|
* Returns 0 on success, negative value otherwise. |
|
|
*/ |
|
|
int ccs_write_alias_policy(char *data, const bool is_delete) |
|
|
{ |
|
|
char *cp = strchr(data, ' '); |
|
|
if (!cp) |
|
|
return -EINVAL; |
|
|
*cp++ = '\0'; |
|
|
return update_alias_entry(data, cp, is_delete); |
|
|
} |
|
|
|
|
|
/* The list for "struct aggregator_entry". */ |
|
|
static LIST1_HEAD(aggregator_list); |
|
|
|
|
|
/** |
|
|
* update_aggregator_entry - Update "struct aggregator_entry" list. |
|
325 |
* |
* |
326 |
* @original_name: The original program's name. |
* @original_name: The original program's name. |
327 |
* @aggregated_name: The aggregated program's name. |
* @aggregated_name: The aggregated program's name. |
329 |
* |
* |
330 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
331 |
*/ |
*/ |
332 |
static int update_aggregator_entry(const char *original_name, |
static int ccs_update_aggregator_entry(const char *original_name, |
333 |
const char *aggregated_name, |
const char *aggregated_name, |
334 |
const bool is_delete) |
const bool is_delete) |
335 |
{ |
{ |
336 |
struct aggregator_entry *new_entry; |
struct ccs_aggregator e = { }; |
337 |
struct aggregator_entry *ptr; |
int error = is_delete ? -ENOENT : -ENOMEM; |
338 |
static DEFINE_MUTEX(lock); |
if (!ccs_correct_word(original_name) || |
339 |
const struct path_info *saved_original_name; |
!ccs_correct_path(aggregated_name)) |
|
const struct path_info *saved_aggregated_name; |
|
|
int error = -ENOMEM; |
|
|
if (!ccs_is_correct_path(original_name, 1, 0, -1, __func__) || |
|
|
!ccs_is_correct_path(aggregated_name, 1, -1, -1, __func__)) |
|
340 |
return -EINVAL; |
return -EINVAL; |
341 |
saved_original_name = ccs_save_name(original_name); |
e.original_name = ccs_get_name(original_name); |
342 |
saved_aggregated_name = ccs_save_name(aggregated_name); |
e.aggregated_name = ccs_get_name(aggregated_name); |
343 |
if (!saved_original_name || !saved_aggregated_name) |
if (!e.original_name || !e.aggregated_name || |
344 |
return -ENOMEM; |
e.aggregated_name->is_patterned) /* No patterns allowed. */ |
345 |
mutex_lock(&lock); |
goto out; |
346 |
list1_for_each_entry(ptr, &aggregator_list, list) { |
error = ccs_update_policy(&e.head, sizeof(e), is_delete, |
347 |
if (ptr->original_name != saved_original_name || |
&ccs_policy_list[CCS_ID_AGGREGATOR], |
348 |
ptr->aggregated_name != saved_aggregated_name) |
ccs_same_aggregator); |
|
continue; |
|
|
ptr->is_deleted = is_delete; |
|
|
error = 0; |
|
|
goto out; |
|
|
} |
|
|
if (is_delete) { |
|
|
error = -ENOENT; |
|
|
goto out; |
|
|
} |
|
|
new_entry = ccs_alloc_element(sizeof(*new_entry)); |
|
|
if (!new_entry) |
|
|
goto out; |
|
|
new_entry->original_name = saved_original_name; |
|
|
new_entry->aggregated_name = saved_aggregated_name; |
|
|
list1_add_tail_mb(&new_entry->list, &aggregator_list); |
|
|
error = 0; |
|
349 |
out: |
out: |
350 |
mutex_unlock(&lock); |
ccs_put_name(e.original_name); |
351 |
ccs_update_counter(CCS_UPDATES_COUNTER_EXCEPTION_POLICY); |
ccs_put_name(e.aggregated_name); |
352 |
return error; |
return error; |
353 |
} |
} |
354 |
|
|
355 |
/** |
/** |
356 |
* ccs_read_aggregator_policy - Read "struct aggregator_entry" list. |
* ccs_write_aggregator - Write "struct ccs_aggregator" list. |
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* |
|
|
* Returns true on success, false otherwise. |
|
|
*/ |
|
|
bool ccs_read_aggregator_policy(struct ccs_io_buffer *head) |
|
|
{ |
|
|
struct list1_head *pos; |
|
|
list1_for_each_cookie(pos, head->read_var2, &aggregator_list) { |
|
|
struct aggregator_entry *ptr; |
|
|
ptr = list1_entry(pos, struct aggregator_entry, list); |
|
|
if (ptr->is_deleted) |
|
|
continue; |
|
|
if (!ccs_io_printf(head, KEYWORD_AGGREGATOR "%s %s\n", |
|
|
ptr->original_name->name, |
|
|
ptr->aggregated_name->name)) |
|
|
goto out; |
|
|
} |
|
|
return true; |
|
|
out: |
|
|
return false; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_write_aggregator_policy - Write "struct aggregator_entry" list. |
|
357 |
* |
* |
358 |
* @data: String to parse. |
* @data: String to parse. |
359 |
* @is_delete: True if it is a delete request. |
* @is_delete: True if it is a delete request. |
360 |
* |
* |
361 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
362 |
*/ |
*/ |
363 |
int ccs_write_aggregator_policy(char *data, const bool is_delete) |
int ccs_write_aggregator(char *data, const bool is_delete) |
364 |
{ |
{ |
365 |
char *cp = strchr(data, ' '); |
char *w[2]; |
366 |
if (!cp) |
if (!ccs_tokenize(data, w, sizeof(w)) || !w[1][0]) |
367 |
return -EINVAL; |
return -EINVAL; |
368 |
*cp++ = '\0'; |
return ccs_update_aggregator_entry(w[0], w[1], is_delete); |
|
return update_aggregator_entry(data, cp, is_delete); |
|
369 |
} |
} |
370 |
|
|
371 |
/* Domain create/delete/undelete handler. */ |
/* Domain create/delete handler. */ |
|
|
|
|
/* #define DEBUG_DOMAIN_UNDELETE */ |
|
372 |
|
|
373 |
/** |
/** |
374 |
* ccs_delete_domain - Delete a domain. |
* ccs_delete_domain - Delete a domain. |
379 |
*/ |
*/ |
380 |
int ccs_delete_domain(char *domainname) |
int ccs_delete_domain(char *domainname) |
381 |
{ |
{ |
382 |
struct domain_info *domain; |
struct ccs_domain_info *domain; |
383 |
struct path_info name; |
struct ccs_path_info name; |
384 |
name.name = domainname; |
name.name = domainname; |
385 |
ccs_fill_path_info(&name); |
ccs_fill_path_info(&name); |
386 |
mutex_lock(&domain_list_lock); |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
387 |
#ifdef DEBUG_DOMAIN_UNDELETE |
return 0; |
|
printk(KERN_DEBUG "ccs_delete_domain %s\n", domainname); |
|
|
list1_for_each_entry(domain, &domain_list, list) { |
|
|
if (ccs_pathcmp(domain->domainname, &name)) |
|
|
continue; |
|
|
printk(KERN_DEBUG "List: %p %u\n", domain, domain->is_deleted); |
|
|
} |
|
|
#endif |
|
388 |
/* Is there an active domain? */ |
/* Is there an active domain? */ |
389 |
list1_for_each_entry(domain, &domain_list, list) { |
list_for_each_entry_rcu(domain, &ccs_domain_list, list) { |
390 |
struct domain_info *domain2; |
/* Never delete ccs_kernel_domain */ |
391 |
/* Never delete KERNEL_DOMAIN */ |
if (domain == &ccs_kernel_domain) |
|
if (domain == &KERNEL_DOMAIN) |
|
392 |
continue; |
continue; |
393 |
if (domain->is_deleted || |
if (domain->is_deleted || |
394 |
ccs_pathcmp(domain->domainname, &name)) |
ccs_pathcmp(domain->domainname, &name)) |
395 |
continue; |
continue; |
396 |
/* Mark already deleted domains as non undeletable. */ |
domain->is_deleted = true; |
|
list1_for_each_entry(domain2, &domain_list, list) { |
|
|
if (!domain2->is_deleted || |
|
|
ccs_pathcmp(domain2->domainname, &name)) |
|
|
continue; |
|
|
#ifdef DEBUG_DOMAIN_UNDELETE |
|
|
if (domain2->is_deleted != 255) |
|
|
printk(KERN_DEBUG |
|
|
"Marked %p as non undeletable\n", |
|
|
domain2); |
|
|
#endif |
|
|
domain2->is_deleted = 255; |
|
|
} |
|
|
/* Delete and mark active domain as undeletable. */ |
|
|
domain->is_deleted = 1; |
|
|
#ifdef DEBUG_DOMAIN_UNDELETE |
|
|
printk(KERN_DEBUG "Marked %p as undeletable\n", domain); |
|
|
#endif |
|
397 |
break; |
break; |
398 |
} |
} |
399 |
mutex_unlock(&domain_list_lock); |
mutex_unlock(&ccs_policy_lock); |
400 |
return 0; |
return 0; |
401 |
} |
} |
402 |
|
|
403 |
/** |
/** |
404 |
* ccs_undelete_domain - Undelete a domain. |
* ccs_assign_domain - Create a domain. |
|
* |
|
|
* @domainname: The name of domain. |
|
|
* |
|
|
* Returns pointer to "struct domain_info" on success, NULL otherwise. |
|
|
*/ |
|
|
struct domain_info *ccs_undelete_domain(const char *domainname) |
|
|
{ |
|
|
struct domain_info *domain; |
|
|
struct domain_info *candidate_domain = NULL; |
|
|
struct path_info name; |
|
|
name.name = domainname; |
|
|
ccs_fill_path_info(&name); |
|
|
mutex_lock(&domain_list_lock); |
|
|
#ifdef DEBUG_DOMAIN_UNDELETE |
|
|
printk(KERN_DEBUG "ccs_undelete_domain %s\n", domainname); |
|
|
list1_for_each_entry(domain, &domain_list, list) { |
|
|
if (ccs_pathcmp(domain->domainname, &name)) |
|
|
continue; |
|
|
printk(KERN_DEBUG "List: %p %u\n", domain, domain->is_deleted); |
|
|
} |
|
|
#endif |
|
|
list1_for_each_entry(domain, &domain_list, list) { |
|
|
if (ccs_pathcmp(&name, domain->domainname)) |
|
|
continue; |
|
|
if (!domain->is_deleted) { |
|
|
/* This domain is active. I can't undelete. */ |
|
|
candidate_domain = NULL; |
|
|
#ifdef DEBUG_DOMAIN_UNDELETE |
|
|
printk(KERN_DEBUG "%p is active. I can't undelete.\n", |
|
|
domain); |
|
|
#endif |
|
|
break; |
|
|
} |
|
|
/* Is this domain undeletable? */ |
|
|
if (domain->is_deleted == 1) |
|
|
candidate_domain = domain; |
|
|
} |
|
|
if (candidate_domain) { |
|
|
candidate_domain->is_deleted = 0; |
|
|
#ifdef DEBUG_DOMAIN_UNDELETE |
|
|
printk(KERN_DEBUG "%p was undeleted.\n", candidate_domain); |
|
|
#endif |
|
|
} |
|
|
mutex_unlock(&domain_list_lock); |
|
|
return candidate_domain; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_find_or_assign_new_domain - Create a domain. |
|
405 |
* |
* |
406 |
* @domainname: The name of domain. |
* @domainname: The name of domain. |
407 |
* @profile: Profile number to assign if the domain was newly created. |
* @profile: Profile number to assign if the domain was newly created. |
408 |
|
* @group: Group number to assign if the domain was newly created. |
409 |
|
* @transit: True if transit to domain found or created. |
410 |
|
* |
411 |
|
* Returns pointer to "struct ccs_domain_info" on success, NULL otherwise. |
412 |
* |
* |
413 |
* Returns pointer to "struct domain_info" on success, NULL otherwise. |
* Caller holds ccs_read_lock(). |
414 |
*/ |
*/ |
415 |
struct domain_info *ccs_find_or_assign_new_domain(const char *domainname, |
struct ccs_domain_info *ccs_assign_domain(const char *domainname, |
416 |
const u8 profile) |
const u8 profile, const u8 group, |
417 |
|
const bool transit) |
418 |
{ |
{ |
419 |
struct domain_info *domain = NULL; |
struct ccs_domain_info e = { }; |
420 |
const struct path_info *saved_domainname; |
struct ccs_domain_info *entry = ccs_find_domain(domainname); |
421 |
mutex_lock(&domain_list_lock); |
bool created = false; |
422 |
domain = ccs_find_domain(domainname); |
if (entry) |
|
if (domain) |
|
|
goto out; |
|
|
if (!ccs_is_correct_domain(domainname, __func__)) |
|
423 |
goto out; |
goto out; |
424 |
saved_domainname = ccs_save_name(domainname); |
if (strlen(domainname) >= CCS_EXEC_TMPSIZE - 10 || |
425 |
if (!saved_domainname) |
!ccs_correct_domain(domainname)) |
426 |
|
return NULL; |
427 |
|
e.profile = profile; |
428 |
|
e.group = group; |
429 |
|
e.domainname = ccs_get_name(domainname); |
430 |
|
if (!e.domainname) |
431 |
|
return NULL; |
432 |
|
if (mutex_lock_interruptible(&ccs_policy_lock)) |
433 |
goto out; |
goto out; |
434 |
/* Can I reuse memory of deleted domain? */ |
entry = ccs_find_domain(domainname); |
435 |
list1_for_each_entry(domain, &domain_list, list) { |
if (!entry) { |
436 |
struct task_struct *p; |
entry = ccs_commit_ok(&e, sizeof(e)); |
437 |
struct acl_info *ptr; |
if (entry) { |
438 |
bool flag; |
INIT_LIST_HEAD(&entry->acl_info_list[0]); |
439 |
if (!domain->is_deleted || |
INIT_LIST_HEAD(&entry->acl_info_list[1]); |
440 |
domain->domainname != saved_domainname) |
list_add_tail_rcu(&entry->list, &ccs_domain_list); |
441 |
continue; |
created = true; |
|
flag = false; |
|
|
/***** CRITICAL SECTION START *****/ |
|
|
read_lock(&tasklist_lock); |
|
|
for_each_process(p) { |
|
|
if (p->domain_info != domain) |
|
|
continue; |
|
|
flag = true; |
|
|
break; |
|
|
} |
|
|
read_unlock(&tasklist_lock); |
|
|
/***** CRITICAL SECTION END *****/ |
|
|
if (flag) |
|
|
continue; |
|
|
#ifdef DEBUG_DOMAIN_UNDELETE |
|
|
printk(KERN_DEBUG "Reusing %p %s\n", domain, |
|
|
domain->domainname->name); |
|
|
#endif |
|
|
list1_for_each_entry(ptr, &domain->acl_info_list, list) { |
|
|
ptr->type |= ACL_DELETED; |
|
442 |
} |
} |
|
ccs_set_domain_flag(domain, true, domain->flags); |
|
|
domain->profile = profile; |
|
|
domain->quota_warned = false; |
|
|
mb(); /* Avoid out-of-order execution. */ |
|
|
domain->is_deleted = 0; |
|
|
goto out; |
|
|
} |
|
|
/* No memory reusable. Create using new memory. */ |
|
|
domain = ccs_alloc_element(sizeof(*domain)); |
|
|
if (domain) { |
|
|
INIT_LIST1_HEAD(&domain->acl_info_list); |
|
|
domain->domainname = saved_domainname; |
|
|
domain->profile = profile; |
|
|
list1_add_tail_mb(&domain->list, &domain_list); |
|
443 |
} |
} |
444 |
|
mutex_unlock(&ccs_policy_lock); |
445 |
out: |
out: |
446 |
mutex_unlock(&domain_list_lock); |
ccs_put_name(e.domainname); |
447 |
return domain; |
if (entry && transit) { |
448 |
} |
current->ccs_domain_info = entry; |
449 |
|
if (created) { |
450 |
/** |
struct ccs_request_info r; |
451 |
* get_argv0 - Get argv[0]. |
ccs_init_request_info(&r, CCS_MAC_FILE_EXECUTE); |
452 |
* |
r.granted = false; |
453 |
* @bprm: Pointer to "struct linux_binprm". |
ccs_write_log(&r, "use_profile %u\n", r.profile); |
|
* @tmp: Buffer for temporal use. |
|
|
* |
|
|
* Returns true on success, false otherwise. |
|
|
*/ |
|
|
static bool get_argv0(struct linux_binprm *bprm, struct ccs_page_buffer *tmp) |
|
|
{ |
|
|
char *arg_ptr = tmp->buffer; |
|
|
int arg_len = 0; |
|
|
unsigned long pos = bprm->p; |
|
|
int i = pos / PAGE_SIZE; |
|
|
int offset = pos % PAGE_SIZE; |
|
|
bool done = false; |
|
|
if (!bprm->argc) |
|
|
goto out; |
|
|
while (1) { |
|
|
struct page *page; |
|
|
const char *kaddr; |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
|
|
if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, |
|
|
NULL) <= 0) |
|
|
goto out; |
|
|
pos += PAGE_SIZE - offset; |
|
|
#else |
|
|
page = bprm->page[i]; |
|
|
#endif |
|
|
/* Map. */ |
|
|
kaddr = kmap(page); |
|
|
if (!kaddr) { /* Mapping failed. */ |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
|
|
put_page(page); |
|
|
#endif |
|
|
goto out; |
|
454 |
} |
} |
|
/* Read. */ |
|
|
while (offset < PAGE_SIZE) { |
|
|
const unsigned char c = kaddr[offset++]; |
|
|
if (c && arg_len < CCS_MAX_PATHNAME_LEN - 10) { |
|
|
if (c == '\\') { |
|
|
arg_ptr[arg_len++] = '\\'; |
|
|
arg_ptr[arg_len++] = '\\'; |
|
|
} else if (c == '/') { |
|
|
arg_len = 0; |
|
|
} else if (c > ' ' && c < 127) { |
|
|
arg_ptr[arg_len++] = c; |
|
|
} else { |
|
|
arg_ptr[arg_len++] = '\\'; |
|
|
arg_ptr[arg_len++] = (c >> 6) + '0'; |
|
|
arg_ptr[arg_len++] |
|
|
= ((c >> 3) & 7) + '0'; |
|
|
arg_ptr[arg_len++] = (c & 7) + '0'; |
|
|
} |
|
|
} else { |
|
|
arg_ptr[arg_len] = '\0'; |
|
|
done = true; |
|
|
break; |
|
|
} |
|
|
} |
|
|
/* Unmap. */ |
|
|
kunmap(page); |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
|
|
put_page(page); |
|
|
#endif |
|
|
i++; |
|
|
offset = 0; |
|
|
if (done) |
|
|
break; |
|
455 |
} |
} |
456 |
return true; |
return entry; |
|
out: |
|
|
return false; |
|
457 |
} |
} |
458 |
|
|
459 |
/** |
/** |
460 |
* find_next_domain - Find a domain. |
* ccs_find_next_domain - Find a domain. |
461 |
* |
* |
462 |
* @r: Pointer to "struct ccs_request_info". |
* @ee: Pointer to "struct ccs_execve". |
|
* @handler: Pathname to verify. May be NULL. |
|
463 |
* |
* |
464 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
465 |
|
* |
466 |
|
* Caller holds ccs_read_lock(). |
467 |
*/ |
*/ |
468 |
static int find_next_domain(struct ccs_request_info *r, |
static int ccs_find_next_domain(struct ccs_execve *ee) |
|
const struct path_info *handler) |
|
469 |
{ |
{ |
470 |
/* |
struct ccs_request_info *r = &ee->r; |
471 |
* This function assumes that the size of buffer returned by |
const struct ccs_path_info *handler = ee->handler; |
472 |
* ccs_realpath() = CCS_MAX_PATHNAME_LEN. |
struct ccs_domain_info *domain = NULL; |
473 |
*/ |
struct ccs_domain_info * const old_domain = ccs_current_domain(); |
474 |
struct domain_info *domain = NULL; |
struct linux_binprm *bprm = ee->bprm; |
475 |
const char *old_domain_name = r->domain->domainname->name; |
struct task_struct *task = current; |
476 |
struct linux_binprm *bprm = r->bprm; |
struct ccs_path_info rn = { }; /* real name */ |
|
struct ccs_page_buffer *tmp = r->obj->tmp; |
|
|
const char *original_name = bprm->filename; |
|
|
const u8 mode = r->mode; |
|
|
const bool is_enforce = (mode == 3); |
|
|
const u32 tomoyo_flags = r->tomoyo_flags; |
|
|
char *new_domain_name = NULL; |
|
|
char *real_program_name = NULL; |
|
|
char *symlink_program_name = NULL; |
|
|
struct path_info rn; /* real name */ |
|
|
struct path_info sn; /* symlink name */ |
|
|
struct path_info ln; /* last name */ |
|
477 |
int retval; |
int retval; |
478 |
|
bool need_kfree = false; |
479 |
{ |
retry: |
480 |
/* |
r->matched_acl = NULL; |
481 |
* Built-in initializers. This is needed because policies are |
if (need_kfree) { |
482 |
* not loaded until starting /sbin/init. |
kfree(rn.name); |
483 |
*/ |
need_kfree = false; |
|
static bool first = true; |
|
|
if (first) { |
|
|
update_domain_initializer_entry(NULL, "/sbin/hotplug", |
|
|
false, false); |
|
|
update_domain_initializer_entry(NULL, "/sbin/modprobe", |
|
|
false, false); |
|
|
first = false; |
|
|
} |
|
484 |
} |
} |
485 |
|
|
486 |
retry: |
/* Get symlink's pathname of program. */ |
487 |
current->tomoyo_flags = tomoyo_flags; |
retval = ccs_symlink_path(bprm->filename, &rn); |
488 |
r->tomoyo_flags = tomoyo_flags; |
if (retval < 0) |
|
/* Get ccs_realpath of program. */ |
|
|
retval = -ENOENT; /* I hope ccs_realpath() won't fail with -ENOMEM. */ |
|
|
ccs_free(real_program_name); |
|
|
real_program_name = ccs_realpath(original_name); |
|
|
if (!real_program_name) |
|
|
goto out; |
|
|
/* Get ccs_realpath of symbolic link. */ |
|
|
ccs_free(symlink_program_name); |
|
|
symlink_program_name = ccs_realpath_nofollow(original_name); |
|
|
if (!symlink_program_name) |
|
489 |
goto out; |
goto out; |
490 |
|
need_kfree = true; |
|
rn.name = real_program_name; |
|
|
ccs_fill_path_info(&rn); |
|
|
sn.name = symlink_program_name; |
|
|
ccs_fill_path_info(&sn); |
|
|
ln.name = ccs_get_last_name(r->domain); |
|
|
ccs_fill_path_info(&ln); |
|
491 |
|
|
492 |
if (handler) { |
if (handler) { |
493 |
if (ccs_pathcmp(&rn, handler)) { |
if (ccs_pathcmp(&rn, handler)) { |
500 |
} |
} |
501 |
goto out; |
goto out; |
502 |
} |
} |
503 |
goto calculate_domain; |
} else { |
504 |
} |
struct ccs_aggregator *ptr; |
505 |
|
/* Check 'aggregator' directive. */ |
506 |
/* Check 'alias' directive. */ |
list_for_each_entry_rcu(ptr, |
507 |
if (ccs_pathcmp(&rn, &sn)) { |
&ccs_policy_list[CCS_ID_AGGREGATOR], |
508 |
struct alias_entry *ptr; |
head.list) { |
509 |
/* Is this program allowed to be called via symbolic links? */ |
if (ptr->head.is_deleted || |
510 |
list1_for_each_entry(ptr, &alias_list, list) { |
!ccs_path_matches_pattern(&rn, ptr->original_name)) |
|
if (ptr->is_deleted || |
|
|
ccs_pathcmp(&rn, ptr->original_name) || |
|
|
ccs_pathcmp(&sn, ptr->aliased_name)) |
|
511 |
continue; |
continue; |
512 |
memset(real_program_name, 0, CCS_MAX_PATHNAME_LEN); |
kfree(rn.name); |
513 |
strncpy(real_program_name, ptr->aliased_name->name, |
need_kfree = false; |
514 |
CCS_MAX_PATHNAME_LEN - 1); |
/* This is OK because it is read only. */ |
515 |
ccs_fill_path_info(&rn); |
rn = *ptr->aggregated_name; |
516 |
break; |
break; |
517 |
} |
} |
|
} |
|
518 |
|
|
519 |
/* Compare basename of real_program_name and argv[0] */ |
/* Check execute permission. */ |
520 |
r->mode = ccs_check_flags(r->domain, CCS_TOMOYO_MAC_FOR_ARGV0); |
retval = ccs_path_permission(r, CCS_TYPE_EXECUTE, &rn); |
521 |
if (bprm->argc > 0 && r->mode) { |
if (retval == CCS_RETRY_REQUEST) |
522 |
char *base_argv0 = tmp->buffer; |
goto retry; |
523 |
const char *base_filename; |
if (retval < 0) |
|
retval = -ENOMEM; |
|
|
if (!get_argv0(bprm, tmp)) |
|
524 |
goto out; |
goto out; |
525 |
base_filename = strrchr(real_program_name, '/'); |
/* |
526 |
if (!base_filename) |
* To be able to specify domainnames with wildcards, use the |
527 |
base_filename = real_program_name; |
* pathname specified in the policy (which may contain |
528 |
else |
* wildcard) rather than the pathname passed to execve() |
529 |
base_filename++; |
* (which never contains wildcard). |
530 |
if (strcmp(base_argv0, base_filename)) { |
*/ |
531 |
retval = ccs_check_argv0_perm(r, &rn, base_argv0); |
if (r->param.path.matched_path) { |
532 |
if (retval == 1) { |
if (need_kfree) |
533 |
r->retry++; |
kfree(rn.name); |
534 |
goto retry; |
need_kfree = false; |
535 |
} |
/* This is OK because it is read only. */ |
536 |
r->retry = 0; |
rn = *r->param.path.matched_path; |
|
r->tomoyo_flags = current->tomoyo_flags; |
|
|
if (retval < 0) |
|
|
goto out; |
|
|
} |
|
|
} |
|
|
|
|
|
/* Check 'aggregator' directive. */ |
|
|
{ |
|
|
struct aggregator_entry *ptr; |
|
|
/* Is this program allowed to be aggregated? */ |
|
|
list1_for_each_entry(ptr, &aggregator_list, list) { |
|
|
if (ptr->is_deleted || |
|
|
!ccs_path_matches_pattern(&rn, ptr->original_name)) |
|
|
continue; |
|
|
memset(real_program_name, 0, CCS_MAX_PATHNAME_LEN); |
|
|
strncpy(real_program_name, ptr->aggregated_name->name, |
|
|
CCS_MAX_PATHNAME_LEN - 1); |
|
|
ccs_fill_path_info(&rn); |
|
|
break; |
|
537 |
} |
} |
538 |
} |
} |
539 |
|
|
540 |
/* Check execute permission. */ |
/* Calculate domain to transit to. */ |
541 |
r->mode = mode; |
switch (ccs_transition_type(old_domain->domainname, &rn)) { |
542 |
retval = ccs_check_exec_perm(r, &rn); |
case CCS_TRANSITION_CONTROL_INITIALIZE: |
543 |
if (retval == 1) { |
/* Transit to the child of ccs_kernel_domain domain. */ |
544 |
r->retry++; |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, CCS_ROOT_NAME " " "%s", |
545 |
goto retry; |
rn.name); |
546 |
} |
break; |
547 |
r->retry = 0; |
case CCS_TRANSITION_CONTROL_KEEP: |
|
r->tomoyo_flags = current->tomoyo_flags; |
|
|
if (retval < 0) |
|
|
goto out; |
|
|
|
|
|
calculate_domain: |
|
|
new_domain_name = tmp->buffer; |
|
|
if (is_domain_initializer(r->domain->domainname, &rn, &ln)) { |
|
|
/* Transit to the child of KERNEL_DOMAIN domain. */ |
|
|
snprintf(new_domain_name, CCS_MAX_PATHNAME_LEN + 1, |
|
|
ROOT_NAME " " "%s", real_program_name); |
|
|
} else if (r->domain == &KERNEL_DOMAIN && !sbin_init_started) { |
|
|
/* |
|
|
* Needn't to transit from kernel domain before starting |
|
|
* /sbin/init. But transit from kernel domain if executing |
|
|
* initializers because they might start before /sbin/init. |
|
|
*/ |
|
|
domain = r->domain; |
|
|
} else if (is_domain_keeper(r->domain->domainname, &rn, &ln)) { |
|
548 |
/* Keep current domain. */ |
/* Keep current domain. */ |
549 |
domain = r->domain; |
domain = old_domain; |
550 |
} else { |
break; |
551 |
/* Normal domain transition. */ |
default: |
552 |
snprintf(new_domain_name, CCS_MAX_PATHNAME_LEN + 1, |
if (old_domain == &ccs_kernel_domain && !ccs_policy_loaded) { |
553 |
"%s %s", old_domain_name, real_program_name); |
/* |
554 |
} |
* Needn't to transit from kernel domain before |
555 |
if (domain || strlen(new_domain_name) >= CCS_MAX_PATHNAME_LEN) |
* starting /sbin/init. But transit from kernel domain |
556 |
goto done; |
* if executing initializers because they might start |
557 |
domain = ccs_find_domain(new_domain_name); |
* before /sbin/init. |
558 |
if (domain) |
*/ |
559 |
goto done; |
domain = old_domain; |
560 |
if (is_enforce) { |
} else { |
561 |
int error = ccs_check_supervisor(r, |
/* Normal domain transition. */ |
562 |
"# wants to create domain\n" |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%s %s", |
563 |
"%s\n", new_domain_name); |
old_domain->domainname->name, rn.name); |
|
if (error == 1) { |
|
|
r->retry++; |
|
|
goto retry; |
|
564 |
} |
} |
565 |
r->retry = 0; |
break; |
|
if (error < 0) |
|
|
goto done; |
|
566 |
} |
} |
567 |
domain = ccs_find_or_assign_new_domain(new_domain_name, r->profile); |
/* |
568 |
|
* Tell GC that I started execve(). |
569 |
|
* Also, tell open_exec() to check read permission. |
570 |
|
*/ |
571 |
|
task->ccs_flags |= CCS_TASK_IS_IN_EXECVE; |
572 |
|
/* |
573 |
|
* Make task->ccs_flags visible to GC before changing |
574 |
|
* task->ccs_domain_info . |
575 |
|
*/ |
576 |
|
smp_mb(); |
577 |
|
/* |
578 |
|
* Proceed to the next domain in order to allow reaching via PID. |
579 |
|
* It will be reverted if execve() failed. Reverting is not good. |
580 |
|
* But it is better than being unable to reach via PID in interactive |
581 |
|
* enforcing mode. |
582 |
|
*/ |
583 |
|
if (!domain) |
584 |
|
domain = ccs_assign_domain(ee->tmp, r->profile, |
585 |
|
old_domain->group, true); |
586 |
if (domain) |
if (domain) |
|
audit_domain_creation_log(domain); |
|
|
done: |
|
|
if (!domain) { |
|
|
printk(KERN_WARNING "TOMOYO-ERROR: Domain '%s' not defined.\n", |
|
|
new_domain_name); |
|
|
if (is_enforce) |
|
|
retval = -EPERM; |
|
|
else { |
|
|
retval = 0; |
|
|
ccs_set_domain_flag(r->domain, false, |
|
|
DOMAIN_FLAGS_TRANSITION_FAILED); |
|
|
} |
|
|
} else { |
|
587 |
retval = 0; |
retval = 0; |
588 |
|
else if (r->mode == CCS_CONFIG_ENFORCING) |
589 |
|
retval = -ENOMEM; |
590 |
|
else { |
591 |
|
retval = 0; |
592 |
|
if (!old_domain->flags[CCS_DIF_TRANSITION_FAILED]) { |
593 |
|
old_domain->flags[CCS_DIF_TRANSITION_FAILED] = true; |
594 |
|
r->granted = false; |
595 |
|
ccs_write_log(r, "%s", |
596 |
|
ccs_dif[CCS_DIF_TRANSITION_FAILED]); |
597 |
|
printk(KERN_WARNING |
598 |
|
"ERROR: Domain '%s' not defined.\n", ee->tmp); |
599 |
|
} |
600 |
} |
} |
601 |
out: |
out: |
602 |
ccs_free(real_program_name); |
if (need_kfree) |
603 |
ccs_free(symlink_program_name); |
kfree(rn.name); |
|
if (domain) |
|
|
r->domain = domain; |
|
604 |
return retval; |
return retval; |
605 |
} |
} |
606 |
|
|
607 |
/** |
/** |
608 |
* check_environ - Check permission for environment variable names. |
* ccs_environ - Check permission for environment variable names. |
609 |
* |
* |
610 |
* @r: Pointer to "struct ccs_request_info". |
* @ee: Pointer to "struct ccs_execve". |
611 |
* |
* |
612 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
613 |
*/ |
*/ |
614 |
static int check_environ(struct ccs_request_info *r) |
static int ccs_environ(struct ccs_execve *ee) |
615 |
{ |
{ |
616 |
struct linux_binprm *bprm = r->bprm; |
struct ccs_request_info *r = &ee->r; |
617 |
struct ccs_page_buffer *tmp = r->obj->tmp; |
struct linux_binprm *bprm = ee->bprm; |
618 |
char *arg_ptr = tmp->buffer; |
/* env_page->data is allocated by ccs_dump_page(). */ |
619 |
|
struct ccs_page_dump env_page = { }; |
620 |
|
char *arg_ptr; /* Size is CCS_EXEC_TMPSIZE bytes */ |
621 |
int arg_len = 0; |
int arg_len = 0; |
622 |
unsigned long pos = bprm->p; |
unsigned long pos = bprm->p; |
|
int i = pos / PAGE_SIZE; |
|
623 |
int offset = pos % PAGE_SIZE; |
int offset = pos % PAGE_SIZE; |
624 |
int argv_count = bprm->argc; |
int argv_count = bprm->argc; |
625 |
int envp_count = bprm->envc; |
int envp_count = bprm->envc; |
626 |
/* printk(KERN_DEBUG "start %d %d\n", argv_count, envp_count); */ |
/* printk(KERN_DEBUG "start %d %d\n", argv_count, envp_count); */ |
627 |
int error = -ENOMEM; |
int error = -ENOMEM; |
628 |
|
ee->r.type = CCS_MAC_ENVIRON; |
629 |
|
ee->r.mode = ccs_get_mode(ccs_current_domain()->profile, |
630 |
|
CCS_MAC_ENVIRON); |
631 |
if (!r->mode || !envp_count) |
if (!r->mode || !envp_count) |
632 |
return 0; |
return 0; |
633 |
|
arg_ptr = kzalloc(CCS_EXEC_TMPSIZE, CCS_GFP_FLAGS); |
634 |
|
if (!arg_ptr) |
635 |
|
goto out; |
636 |
while (error == -ENOMEM) { |
while (error == -ENOMEM) { |
637 |
struct page *page; |
if (!ccs_dump_page(bprm, pos, &env_page)) |
|
const char *kaddr; |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
|
|
if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, |
|
|
NULL) <= 0) |
|
638 |
goto out; |
goto out; |
639 |
pos += PAGE_SIZE - offset; |
pos += PAGE_SIZE - offset; |
|
#else |
|
|
page = bprm->page[i]; |
|
|
#endif |
|
|
/* Map. */ |
|
|
kaddr = kmap(page); |
|
|
if (!kaddr) { /* Mapping failed. */ |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
|
|
put_page(page); |
|
|
#endif |
|
|
goto out; |
|
|
} |
|
640 |
/* Read. */ |
/* Read. */ |
641 |
while (argv_count && offset < PAGE_SIZE) { |
while (argv_count && offset < PAGE_SIZE) { |
642 |
if (!kaddr[offset++]) |
if (!env_page.data[offset++]) |
643 |
argv_count--; |
argv_count--; |
644 |
} |
} |
645 |
if (argv_count) |
if (argv_count) { |
646 |
goto unmap_page; |
offset = 0; |
647 |
|
continue; |
648 |
|
} |
649 |
while (offset < PAGE_SIZE) { |
while (offset < PAGE_SIZE) { |
650 |
const unsigned char c = kaddr[offset++]; |
const unsigned char c = env_page.data[offset++]; |
651 |
if (c && arg_len < CCS_MAX_PATHNAME_LEN - 10) { |
if (c && arg_len < CCS_EXEC_TMPSIZE - 10) { |
652 |
if (c == '=') { |
if (c == '=') { |
653 |
arg_ptr[arg_len++] = '\0'; |
arg_ptr[arg_len++] = '\0'; |
654 |
} else if (c == '\\') { |
} else if (c == '\\') { |
668 |
} |
} |
669 |
if (c) |
if (c) |
670 |
continue; |
continue; |
671 |
if (ccs_check_env_perm(r, arg_ptr)) { |
if (ccs_env_perm(r, arg_ptr)) { |
672 |
error = -EPERM; |
error = -EPERM; |
673 |
break; |
break; |
674 |
} |
} |
678 |
} |
} |
679 |
arg_len = 0; |
arg_len = 0; |
680 |
} |
} |
|
unmap_page: |
|
|
/* Unmap. */ |
|
|
kunmap(page); |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
|
|
put_page(page); |
|
|
#endif |
|
|
i++; |
|
681 |
offset = 0; |
offset = 0; |
682 |
} |
} |
683 |
out: |
out: |
684 |
if (r->mode != 3) |
if (r->mode != 3) |
685 |
error = 0; |
error = 0; |
686 |
|
kfree(env_page.data); |
687 |
|
kfree(arg_ptr); |
688 |
return error; |
return error; |
689 |
} |
} |
690 |
|
|
691 |
/** |
/** |
692 |
* unescape - Unescape escaped string. |
* ccs_unescape - Unescape escaped string. |
693 |
* |
* |
694 |
* @dest: String to unescape. |
* @dest: String to unescape. |
695 |
* |
* |
696 |
* Returns nothing. |
* Returns nothing. |
697 |
*/ |
*/ |
698 |
static void unescape(unsigned char *dest) |
static void ccs_unescape(unsigned char *dest) |
699 |
{ |
{ |
700 |
unsigned char *src = dest; |
unsigned char *src = dest; |
701 |
unsigned char c; |
unsigned char c; |
702 |
unsigned char d; |
unsigned char d; |
703 |
unsigned char e; |
unsigned char e; |
704 |
while ((c = *src++) != '\0') { |
while (1) { |
705 |
|
c = *src++; |
706 |
|
if (!c) |
707 |
|
break; |
708 |
if (c != '\\') { |
if (c != '\\') { |
709 |
*dest++ = c; |
*dest++ = c; |
710 |
continue; |
continue; |
727 |
*dest = '\0'; |
*dest = '\0'; |
728 |
} |
} |
729 |
|
|
730 |
/** |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 36) |
731 |
* root_depth - Get number of directories to strip. |
static int ccs_copy_argv(const char *arg, struct linux_binprm *bprm) |
|
* |
|
|
* @dentry: Pointer to "struct dentry". |
|
|
* @vfsmnt: Pointer to "struct vfsmount". |
|
|
* |
|
|
* Returns number of directories to strip. |
|
|
*/ |
|
|
static inline int root_depth(struct dentry *dentry, struct vfsmount *vfsmnt) |
|
732 |
{ |
{ |
733 |
int depth = 0; |
const int ret = copy_strings_kernel(1, &arg, bprm); |
734 |
/***** CRITICAL SECTION START *****/ |
if (ret >= 0) |
735 |
ccs_realpath_lock(); |
bprm->argc++; |
736 |
for (;;) { |
return ret; |
|
if (dentry == vfsmnt->mnt_root || IS_ROOT(dentry)) { |
|
|
/* Global root? */ |
|
|
if (vfsmnt->mnt_parent == vfsmnt) |
|
|
break; |
|
|
dentry = vfsmnt->mnt_mountpoint; |
|
|
vfsmnt = vfsmnt->mnt_parent; |
|
|
continue; |
|
|
} |
|
|
dentry = dentry->d_parent; |
|
|
depth++; |
|
|
} |
|
|
ccs_realpath_unlock(); |
|
|
/***** CRITICAL SECTION END *****/ |
|
|
return depth; |
|
737 |
} |
} |
|
|
|
|
/** |
|
|
* get_root_depth - return the depth of root directory. |
|
|
* |
|
|
* Returns number of directories to strip. |
|
|
*/ |
|
|
static int get_root_depth(void) |
|
|
{ |
|
|
int depth; |
|
|
struct dentry *dentry; |
|
|
struct vfsmount *vfsmnt; |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
|
|
struct path root; |
|
|
#endif |
|
|
/***** CRITICAL SECTION START *****/ |
|
|
read_lock(¤t->fs->lock); |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
|
|
root = current->fs->root; |
|
|
path_get(¤t->fs->root); |
|
|
dentry = root.dentry; |
|
|
vfsmnt = root.mnt; |
|
|
#else |
|
|
dentry = dget(current->fs->root); |
|
|
vfsmnt = mntget(current->fs->rootmnt); |
|
|
#endif |
|
|
read_unlock(¤t->fs->lock); |
|
|
/***** CRITICAL SECTION END *****/ |
|
|
depth = root_depth(dentry, vfsmnt); |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
|
|
path_put(&root); |
|
738 |
#else |
#else |
739 |
dput(dentry); |
static int ccs_copy_argv(char *arg, struct linux_binprm *bprm) |
740 |
mntput(vfsmnt); |
{ |
741 |
#endif |
const int ret = copy_strings_kernel(1, &arg, bprm); |
742 |
return depth; |
if (ret >= 0) |
743 |
|
bprm->argc++; |
744 |
|
return ret; |
745 |
} |
} |
746 |
|
#endif |
747 |
|
|
748 |
/** |
/** |
749 |
* try_alt_exec - Try to start execute handler. |
* ccs_try_alt_exec - Try to start execute handler. |
750 |
* |
* |
751 |
* @r: Pointer to "struct ccs_request_info". |
* @ee: Pointer to "struct ccs_execve". |
|
* @handler: Pointer to the name of execute handler. |
|
|
* @eh_path: Pointer to pointer to the name of execute handler. |
|
752 |
* |
* |
753 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
754 |
*/ |
*/ |
755 |
static int try_alt_exec(struct ccs_request_info *r, |
static int ccs_try_alt_exec(struct ccs_execve *ee) |
|
const struct path_info *handler, char **eh_path) |
|
756 |
{ |
{ |
757 |
/* |
/* |
758 |
* Contents of modified bprm. |
* Contents of modified bprm. |
766 |
* = 0 |
* = 0 |
767 |
* |
* |
768 |
* modified bprm->argv[0] |
* modified bprm->argv[0] |
769 |
* = the program's name specified by execute_handler |
* = the program's name specified by *_execute_handler |
770 |
* modified bprm->argv[1] |
* modified bprm->argv[1] |
771 |
* = current->domain_info->domainname->name |
* = ccs_current_domain()->domainname->name |
772 |
* modified bprm->argv[2] |
* modified bprm->argv[2] |
773 |
* = the current process's name |
* = the current process's name |
774 |
* modified bprm->argv[3] |
* modified bprm->argv[3] |
790 |
* modified bprm->argv[bprm->envc + bprm->argc + 6] |
* modified bprm->argv[bprm->envc + bprm->argc + 6] |
791 |
* = original bprm->envp[bprm->envc - 1] |
* = original bprm->envp[bprm->envc - 1] |
792 |
*/ |
*/ |
793 |
struct linux_binprm *bprm = r->bprm; |
struct linux_binprm *bprm = ee->bprm; |
794 |
struct file *filp; |
struct file *filp; |
795 |
int retval; |
int retval; |
796 |
const int original_argc = bprm->argc; |
const int original_argc = bprm->argc; |
797 |
const int original_envc = bprm->envc; |
const int original_envc = bprm->envc; |
798 |
struct task_struct *task = current; |
struct task_struct *task = current; |
|
char *buffer = r->obj->tmp->buffer; |
|
|
/* Allocate memory for execute handler's pathname. */ |
|
|
char *execute_handler = ccs_alloc(sizeof(struct ccs_page_buffer)); |
|
|
*eh_path = execute_handler; |
|
|
if (!execute_handler) |
|
|
return -ENOMEM; |
|
|
strncpy(execute_handler, handler->name, |
|
|
sizeof(struct ccs_page_buffer) - 1); |
|
|
unescape(execute_handler); |
|
799 |
|
|
800 |
/* Close the requested program's dentry. */ |
/* Close the requested program's dentry. */ |
801 |
|
ee->obj.path1.dentry = NULL; |
802 |
|
ee->obj.path1.mnt = NULL; |
803 |
|
ee->obj.validate_done = false; |
804 |
allow_write_access(bprm->file); |
allow_write_access(bprm->file); |
805 |
fput(bprm->file); |
fput(bprm->file); |
806 |
bprm->file = NULL; |
bprm->file = NULL; |
807 |
|
|
808 |
{ /* Adjust root directory for open_exec(). */ |
/* Invalidate page dump cache. */ |
809 |
int depth = get_root_depth(); |
ee->dump.page = NULL; |
|
char *cp = execute_handler; |
|
|
if (!*cp || *cp != '/') |
|
|
return -ENOENT; |
|
|
while (depth) { |
|
|
cp = strchr(cp + 1, '/'); |
|
|
if (!cp) |
|
|
return -ENOENT; |
|
|
depth--; |
|
|
} |
|
|
memmove(execute_handler, cp, strlen(cp) + 1); |
|
|
} |
|
810 |
|
|
811 |
/* Move envp[] to argv[] */ |
/* Move envp[] to argv[] */ |
812 |
bprm->argc += bprm->envc; |
bprm->argc += bprm->envc; |
814 |
|
|
815 |
/* Set argv[6] */ |
/* Set argv[6] */ |
816 |
{ |
{ |
817 |
snprintf(buffer, sizeof(struct ccs_page_buffer) - 1, "%d", |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%d", original_envc); |
818 |
original_envc); |
retval = ccs_copy_argv(ee->tmp, bprm); |
|
retval = copy_strings_kernel(1, &buffer, bprm); |
|
819 |
if (retval < 0) |
if (retval < 0) |
820 |
goto out; |
goto out; |
|
bprm->argc++; |
|
821 |
} |
} |
822 |
|
|
823 |
/* Set argv[5] */ |
/* Set argv[5] */ |
824 |
{ |
{ |
825 |
snprintf(buffer, sizeof(struct ccs_page_buffer) - 1, "%d", |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%d", original_argc); |
826 |
original_argc); |
retval = ccs_copy_argv(ee->tmp, bprm); |
|
retval = copy_strings_kernel(1, &buffer, bprm); |
|
827 |
if (retval < 0) |
if (retval < 0) |
828 |
goto out; |
goto out; |
|
bprm->argc++; |
|
829 |
} |
} |
830 |
|
|
831 |
/* Set argv[4] */ |
/* Set argv[4] */ |
832 |
{ |
{ |
833 |
retval = copy_strings_kernel(1, &bprm->filename, bprm); |
retval = ccs_copy_argv(bprm->filename, bprm); |
834 |
if (retval < 0) |
if (retval < 0) |
835 |
goto out; |
goto out; |
|
bprm->argc++; |
|
836 |
} |
} |
837 |
|
|
838 |
/* Set argv[3] */ |
/* Set argv[3] */ |
839 |
{ |
{ |
840 |
const u32 tomoyo_flags = task->tomoyo_flags; |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, |
|
snprintf(buffer, sizeof(struct ccs_page_buffer) - 1, |
|
841 |
"pid=%d uid=%d gid=%d euid=%d egid=%d suid=%d " |
"pid=%d uid=%d gid=%d euid=%d egid=%d suid=%d " |
842 |
"sgid=%d fsuid=%d fsgid=%d state[0]=%u " |
"sgid=%d fsuid=%d fsgid=%d", |
843 |
"state[1]=%u state[2]=%u", |
(pid_t) ccsecurity_exports.sys_getpid(), |
844 |
task->pid, task->uid, task->gid, task->euid, |
current_uid(), current_gid(), current_euid(), |
845 |
task->egid, task->suid, task->sgid, task->fsuid, |
current_egid(), current_suid(), current_sgid(), |
846 |
task->fsgid, (u8) (tomoyo_flags >> 24), |
current_fsuid(), current_fsgid()); |
847 |
(u8) (tomoyo_flags >> 16), (u8) (tomoyo_flags >> 8)); |
retval = ccs_copy_argv(ee->tmp, bprm); |
|
retval = copy_strings_kernel(1, &buffer, bprm); |
|
848 |
if (retval < 0) |
if (retval < 0) |
849 |
goto out; |
goto out; |
|
bprm->argc++; |
|
850 |
} |
} |
851 |
|
|
852 |
/* Set argv[2] */ |
/* Set argv[2] */ |
853 |
{ |
{ |
854 |
char *exe = (char *) ccs_get_exe(); |
char *exe = (char *) ccs_get_exe(); |
855 |
if (exe) { |
if (exe) { |
856 |
retval = copy_strings_kernel(1, &exe, bprm); |
retval = ccs_copy_argv(exe, bprm); |
857 |
ccs_free(exe); |
kfree(exe); |
858 |
} else { |
} else { |
859 |
snprintf(buffer, sizeof(struct ccs_page_buffer) - 1, |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 36) |
860 |
"<unknown>"); |
retval = ccs_copy_argv("<unknown>", bprm); |
861 |
retval = copy_strings_kernel(1, &buffer, bprm); |
#else |
862 |
|
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "<unknown>"); |
863 |
|
retval = ccs_copy_argv(ee->tmp, bprm); |
864 |
|
#endif |
865 |
} |
} |
866 |
if (retval < 0) |
if (retval < 0) |
867 |
goto out; |
goto out; |
|
bprm->argc++; |
|
868 |
} |
} |
869 |
|
|
870 |
/* Set argv[1] */ |
/* Set argv[1] */ |
871 |
{ |
{ |
872 |
strncpy(buffer, task->domain_info->domainname->name, |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 36) |
873 |
sizeof(struct ccs_page_buffer) - 1); |
retval = ccs_copy_argv(ccs_current_domain()->domainname->name, |
874 |
retval = copy_strings_kernel(1, &buffer, bprm); |
bprm); |
875 |
|
#else |
876 |
|
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%s", |
877 |
|
ccs_current_domain()->domainname->name); |
878 |
|
retval = ccs_copy_argv(ee->tmp, bprm); |
879 |
|
#endif |
880 |
if (retval < 0) |
if (retval < 0) |
881 |
goto out; |
goto out; |
|
bprm->argc++; |
|
882 |
} |
} |
883 |
|
|
884 |
/* Set argv[0] */ |
/* Set argv[0] */ |
885 |
{ |
{ |
886 |
retval = copy_strings_kernel(1, &execute_handler, bprm); |
struct path root; |
887 |
|
char *cp; |
888 |
|
int root_len; |
889 |
|
int handler_len; |
890 |
|
get_fs_root(current->fs, &root); |
891 |
|
cp = ccs_realpath_from_path(&root); |
892 |
|
path_put(&root); |
893 |
|
if (!cp) { |
894 |
|
retval = -ENOMEM; |
895 |
|
goto out; |
896 |
|
} |
897 |
|
root_len = strlen(cp); |
898 |
|
retval = strncmp(ee->handler->name, cp, root_len); |
899 |
|
root_len--; |
900 |
|
kfree(cp); |
901 |
|
if (retval) { |
902 |
|
retval = -ENOENT; |
903 |
|
goto out; |
904 |
|
} |
905 |
|
handler_len = ee->handler->total_len + 1; |
906 |
|
cp = kmalloc(handler_len, CCS_GFP_FLAGS); |
907 |
|
if (!cp) { |
908 |
|
retval = -ENOMEM; |
909 |
|
goto out; |
910 |
|
} |
911 |
|
/* ee->handler_path is released by ccs_finish_execve(). */ |
912 |
|
ee->handler_path = cp; |
913 |
|
/* Adjust root directory for open_exec(). */ |
914 |
|
memmove(cp, ee->handler->name + root_len, |
915 |
|
handler_len - root_len); |
916 |
|
ccs_unescape(cp); |
917 |
|
retval = -ENOENT; |
918 |
|
if (!*cp || *cp != '/') |
919 |
|
goto out; |
920 |
|
retval = ccs_copy_argv(cp, bprm); |
921 |
if (retval < 0) |
if (retval < 0) |
922 |
goto out; |
goto out; |
|
bprm->argc++; |
|
923 |
} |
} |
924 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) |
925 |
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 24) |
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 24) |
927 |
#endif |
#endif |
928 |
#endif |
#endif |
929 |
|
|
930 |
/* OK, now restart the process with execute handler program's dentry. */ |
/* |
931 |
filp = open_exec(execute_handler); |
* OK, now restart the process with execute handler program's dentry. |
932 |
|
*/ |
933 |
|
filp = open_exec(ee->handler_path); |
934 |
if (IS_ERR(filp)) { |
if (IS_ERR(filp)) { |
935 |
retval = PTR_ERR(filp); |
retval = PTR_ERR(filp); |
936 |
goto out; |
goto out; |
937 |
} |
} |
938 |
|
ee->obj.path1.dentry = filp->f_dentry; |
939 |
|
ee->obj.path1.mnt = filp->f_vfsmnt; |
940 |
bprm->file = filp; |
bprm->file = filp; |
941 |
bprm->filename = execute_handler; |
bprm->filename = ee->handler_path; |
942 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
943 |
bprm->interp = execute_handler; |
bprm->interp = bprm->filename; |
944 |
#endif |
#endif |
945 |
retval = prepare_binprm(bprm); |
retval = prepare_binprm(bprm); |
946 |
if (retval < 0) |
if (retval < 0) |
947 |
goto out; |
goto out; |
948 |
task->tomoyo_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
task->ccs_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
949 |
retval = find_next_domain(r, handler); |
retval = ccs_find_next_domain(ee); |
950 |
task->tomoyo_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
task->ccs_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
951 |
out: |
out: |
952 |
return retval; |
return retval; |
953 |
} |
} |
954 |
|
|
955 |
/** |
/** |
956 |
* find_execute_handler - Find an execute handler. |
* ccs_find_execute_handler - Find an execute handler. |
957 |
* |
* |
958 |
|
* @ee: Pointer to "struct ccs_execve". |
959 |
* @type: Type of execute handler. |
* @type: Type of execute handler. |
960 |
* |
* |
961 |
* Returns pointer to "struct path_info" if found, NULL otherwise. |
* Returns true if found, false otherwise. |
962 |
|
* |
963 |
|
* Caller holds ccs_read_lock(). |
964 |
*/ |
*/ |
965 |
static const struct path_info *find_execute_handler(const u8 type) |
static bool ccs_find_execute_handler(struct ccs_execve *ee, const u8 type) |
966 |
{ |
{ |
967 |
struct task_struct *task = current; |
struct ccs_request_info *r = &ee->r; |
|
const struct domain_info *domain = task->domain_info; |
|
|
struct acl_info *ptr; |
|
968 |
/* |
/* |
969 |
* Don't use execute handler if the current process is |
* To avoid infinite execute handler loop, don't use execute handler |
970 |
* marked as execute handler to avoid infinite execute handler loop. |
* if the current process is marked as execute handler . |
971 |
*/ |
*/ |
972 |
if (task->tomoyo_flags & TOMOYO_TASK_IS_EXECUTE_HANDLER) |
if (current->ccs_flags & CCS_TASK_IS_EXECUTE_HANDLER) |
973 |
return NULL; |
return false; |
974 |
list1_for_each_entry(ptr, &domain->acl_info_list, list) { |
r->param_type = type; |
975 |
struct execute_handler_record *acl; |
ccs_check_acl(r, NULL); |
976 |
if (ptr->type != type) |
if (!r->granted) |
977 |
continue; |
return false; |
978 |
acl = container_of(ptr, struct execute_handler_record, head); |
ee->handler = container_of(r->matched_acl, struct ccs_handler_acl, |
979 |
return acl->handler; |
head)->handler; |
980 |
} |
return true; |
|
return NULL; |
|
981 |
} |
} |
982 |
|
|
983 |
/* List of next_domain which is used for checking interpreter's permissions. */ |
#ifdef CONFIG_MMU |
984 |
struct execve_entry { |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) |
985 |
struct list_head list; |
#define CCS_BPRM_MMU |
986 |
struct task_struct *task; |
#elif defined(RHEL_MAJOR) && RHEL_MAJOR == 5 && defined(RHEL_MINOR) && RHEL_MINOR >= 3 |
987 |
struct domain_info *next_domain; |
#define CCS_BPRM_MMU |
988 |
}; |
#elif defined(AX_MAJOR) && AX_MAJOR == 3 && defined(AX_MINOR) && AX_MINOR >= 2 |
989 |
|
#define CCS_BPRM_MMU |
990 |
static LIST_HEAD(execve_list); |
#endif |
991 |
static DEFINE_SPINLOCK(execve_list_lock); |
#endif |
992 |
|
|
993 |
/** |
/** |
994 |
* ccs_register_next_domain - Remember next_domain. |
* ccs_dump_page - Dump a page to buffer. |
995 |
* |
* |
996 |
* @next_domain: Pointer to "struct domain_info". |
* @bprm: Pointer to "struct linux_binprm". |
997 |
|
* @pos: Location to dump. |
998 |
|
* @dump: Poiner to "struct ccs_page_dump". |
999 |
* |
* |
1000 |
* Returns 0 on success, -ENOMEM otherwise. |
* Returns true on success, false otherwise. |
1001 |
*/ |
*/ |
1002 |
static int ccs_register_next_domain(struct domain_info *next_domain) |
bool ccs_dump_page(struct linux_binprm *bprm, unsigned long pos, |
1003 |
|
struct ccs_page_dump *dump) |
1004 |
{ |
{ |
1005 |
struct execve_entry *ee = kmalloc(sizeof(*ee), GFP_KERNEL); |
struct page *page; |
1006 |
if (!ee) |
/* dump->data is released by ccs_finish_execve(). */ |
1007 |
return -ENOMEM; |
if (!dump->data) { |
1008 |
ee->task = current; |
dump->data = kzalloc(PAGE_SIZE, CCS_GFP_FLAGS); |
1009 |
ee->next_domain = next_domain; |
if (!dump->data) |
1010 |
/***** CRITICAL SECTION START *****/ |
return false; |
1011 |
spin_lock(&execve_list_lock); |
} |
1012 |
list_add(&ee->list, &execve_list); |
/* Same with get_arg_page(bprm, pos, 0) in fs/exec.c */ |
1013 |
spin_unlock(&execve_list_lock); |
#ifdef CCS_BPRM_MMU |
1014 |
/***** CRITICAL SECTION END *****/ |
if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0) |
1015 |
return 0; |
return false; |
1016 |
|
#else |
1017 |
|
page = bprm->page[pos / PAGE_SIZE]; |
1018 |
|
#endif |
1019 |
|
if (page != dump->page) { |
1020 |
|
const unsigned int offset = pos % PAGE_SIZE; |
1021 |
|
/* |
1022 |
|
* Maybe kmap()/kunmap() should be used here. |
1023 |
|
* But remove_arg_zero() uses kmap_atomic()/kunmap_atomic(). |
1024 |
|
* So do I. |
1025 |
|
*/ |
1026 |
|
char *kaddr = kmap_atomic(page, KM_USER0); |
1027 |
|
dump->page = page; |
1028 |
|
memcpy(dump->data + offset, kaddr + offset, |
1029 |
|
PAGE_SIZE - offset); |
1030 |
|
kunmap_atomic(kaddr, KM_USER0); |
1031 |
|
} |
1032 |
|
/* Same with put_arg_page(page) in fs/exec.c */ |
1033 |
|
#ifdef CCS_BPRM_MMU |
1034 |
|
put_page(page); |
1035 |
|
#endif |
1036 |
|
return true; |
1037 |
} |
} |
1038 |
|
|
1039 |
/** |
/** |
1040 |
* ccs_fetch_next_domain - Fetch next_domain from the list. |
* ccs_start_execve - Prepare for execve() operation. |
1041 |
* |
* |
1042 |
* Returns pointer to "struct domain_info" which will be used if execve() |
* @bprm: Pointer to "struct linux_binprm". |
1043 |
* succeeds. This function does not return NULL. |
* @eep: Pointer to "struct ccs_execve *". |
1044 |
|
* |
1045 |
|
* Returns 0 on success, negative value otherwise. |
1046 |
*/ |
*/ |
1047 |
struct domain_info *ccs_fetch_next_domain(void) |
static int ccs_start_execve(struct linux_binprm *bprm, |
1048 |
|
struct ccs_execve **eep) |
1049 |
{ |
{ |
1050 |
|
int retval; |
1051 |
struct task_struct *task = current; |
struct task_struct *task = current; |
1052 |
struct domain_info *next_domain = task->domain_info; |
struct ccs_execve *ee; |
1053 |
struct execve_entry *p; |
*eep = NULL; |
1054 |
/***** CRITICAL SECTION START *****/ |
ee = kzalloc(sizeof(*ee), CCS_GFP_FLAGS); |
1055 |
spin_lock(&execve_list_lock); |
if (!ee) |
1056 |
list_for_each_entry(p, &execve_list, list) { |
return -ENOMEM; |
1057 |
if (p->task != task) |
ee->tmp = kzalloc(CCS_EXEC_TMPSIZE, CCS_GFP_FLAGS); |
1058 |
continue; |
if (!ee->tmp) { |
1059 |
next_domain = p->next_domain; |
kfree(ee); |
1060 |
break; |
return -ENOMEM; |
1061 |
} |
} |
1062 |
spin_unlock(&execve_list_lock); |
ee->reader_idx = ccs_read_lock(); |
1063 |
/***** CRITICAL SECTION END *****/ |
/* ee->dump->data is allocated by ccs_dump_page(). */ |
1064 |
return next_domain; |
ee->previous_domain = task->ccs_domain_info; |
1065 |
|
/* Clear manager flag. */ |
1066 |
|
task->ccs_flags &= ~CCS_TASK_IS_MANAGER; |
1067 |
|
*eep = ee; |
1068 |
|
ccs_init_request_info(&ee->r, CCS_MAC_FILE_EXECUTE); |
1069 |
|
ee->r.ee = ee; |
1070 |
|
ee->bprm = bprm; |
1071 |
|
ee->r.obj = &ee->obj; |
1072 |
|
ee->obj.path1.dentry = bprm->file->f_dentry; |
1073 |
|
ee->obj.path1.mnt = bprm->file->f_vfsmnt; |
1074 |
|
/* |
1075 |
|
* No need to call ccs_environ() for execute handler because envp[] is |
1076 |
|
* moved to argv[]. |
1077 |
|
*/ |
1078 |
|
if (ccs_find_execute_handler(ee, CCS_TYPE_AUTO_EXECUTE_HANDLER)) |
1079 |
|
return ccs_try_alt_exec(ee); |
1080 |
|
retval = ccs_find_next_domain(ee); |
1081 |
|
if (retval == -EPERM) { |
1082 |
|
if (ccs_find_execute_handler(ee, |
1083 |
|
CCS_TYPE_DENIED_EXECUTE_HANDLER)) |
1084 |
|
return ccs_try_alt_exec(ee); |
1085 |
|
} |
1086 |
|
if (!retval) |
1087 |
|
retval = ccs_environ(ee); |
1088 |
|
return retval; |
1089 |
} |
} |
1090 |
|
|
1091 |
/** |
/** |
1092 |
* ccs_unregister_next_domain - Forget next_domain. |
* ccs_finish_execve - Clean up execve() operation. |
1093 |
|
* |
1094 |
|
* @retval: Return code of an execve() operation. |
1095 |
|
* @ee: Pointer to "struct ccs_execve". |
1096 |
|
* |
1097 |
|
* Caller holds ccs_read_lock(). |
1098 |
*/ |
*/ |
1099 |
static void ccs_unregister_next_domain(void) |
static void ccs_finish_execve(int retval, struct ccs_execve *ee) |
1100 |
{ |
{ |
1101 |
struct task_struct *task = current; |
struct task_struct *task = current; |
1102 |
struct execve_entry *p; |
if (!ee) |
1103 |
struct execve_entry *ee = NULL; |
return; |
1104 |
/***** CRITICAL SECTION START *****/ |
if (retval < 0) { |
1105 |
spin_lock(&execve_list_lock); |
task->ccs_domain_info = ee->previous_domain; |
1106 |
list_for_each_entry(p, &execve_list, list) { |
/* |
1107 |
if (p->task != task) |
* Make task->ccs_domain_info visible to GC before changing |
1108 |
continue; |
* task->ccs_flags . |
1109 |
list_del(&p->list); |
*/ |
1110 |
ee = p; |
smp_mb(); |
1111 |
break; |
} else { |
1112 |
|
/* Mark the current process as execute handler. */ |
1113 |
|
if (ee->handler) |
1114 |
|
task->ccs_flags |= CCS_TASK_IS_EXECUTE_HANDLER; |
1115 |
|
/* Mark the current process as normal process. */ |
1116 |
|
else |
1117 |
|
task->ccs_flags &= ~CCS_TASK_IS_EXECUTE_HANDLER; |
1118 |
} |
} |
1119 |
spin_unlock(&execve_list_lock); |
/* Tell GC that I finished execve(). */ |
1120 |
/***** CRITICAL SECTION END *****/ |
task->ccs_flags &= ~CCS_TASK_IS_IN_EXECVE; |
1121 |
|
ccs_read_unlock(ee->reader_idx); |
1122 |
|
kfree(ee->handler_path); |
1123 |
|
kfree(ee->tmp); |
1124 |
|
kfree(ee->dump.data); |
1125 |
kfree(ee); |
kfree(ee); |
1126 |
} |
} |
1127 |
|
|
1128 |
/** |
static int __ccs_search_binary_handler(struct linux_binprm *bprm, |
1129 |
* search_binary_handler_with_transition - Perform domain transition. |
struct pt_regs *regs) |
|
* |
|
|
* @bprm: Pointer to "struct linux_binprm". |
|
|
* @regs: Pointer to "struct pt_regs". |
|
|
* |
|
|
* Returns result of search_binary_handler() on success, |
|
|
* negative value otherwise. |
|
|
*/ |
|
|
int search_binary_handler_with_transition(struct linux_binprm *bprm, |
|
|
struct pt_regs *regs) |
|
1130 |
{ |
{ |
1131 |
|
struct ccs_execve *ee; |
1132 |
int retval; |
int retval; |
1133 |
struct task_struct *task = current; |
if (!ccs_policy_loaded) |
1134 |
const struct path_info *handler; |
ccsecurity_exports.load_policy(bprm->filename); |
1135 |
struct ccs_request_info r; |
retval = ccs_start_execve(bprm, &ee); |
1136 |
struct obj_info obj; |
if (!retval) |
1137 |
/* |
retval = search_binary_handler(bprm, regs); |
1138 |
* "eh_path" holds path to execute handler program. |
ccs_finish_execve(retval, ee); |
|
* Thus, keep valid until search_binary_handler() finishes. |
|
|
*/ |
|
|
char *eh_path = NULL; |
|
|
struct ccs_page_buffer *tmp = ccs_alloc(sizeof(struct ccs_page_buffer)); |
|
|
memset(&obj, 0, sizeof(obj)); |
|
|
if (!sbin_init_started) |
|
|
ccs_load_policy(bprm->filename); |
|
|
if (!tmp) |
|
|
return -ENOMEM; |
|
|
|
|
|
ccs_init_request_info(&r, NULL, CCS_TOMOYO_MAC_FOR_FILE); |
|
|
r.bprm = bprm; |
|
|
r.obj = &obj; |
|
|
obj.path1_dentry = bprm->file->f_dentry; |
|
|
obj.path1_vfsmnt = bprm->file->f_vfsmnt; |
|
|
obj.tmp = tmp; |
|
|
|
|
|
/* Clear manager flag. */ |
|
|
task->tomoyo_flags &= ~CCS_TASK_IS_POLICY_MANAGER; |
|
|
handler = find_execute_handler(TYPE_EXECUTE_HANDLER); |
|
|
if (handler) { |
|
|
retval = try_alt_exec(&r, handler, &eh_path); |
|
|
if (!retval) |
|
|
audit_execute_handler_log(true, handler->name, bprm); |
|
|
goto ok; |
|
|
} |
|
|
retval = find_next_domain(&r, NULL); |
|
|
if (retval != -EPERM) |
|
|
goto ok; |
|
|
handler = find_execute_handler(TYPE_DENIED_EXECUTE_HANDLER); |
|
|
if (handler) { |
|
|
retval = try_alt_exec(&r, handler, &eh_path); |
|
|
if (!retval) |
|
|
audit_execute_handler_log(false, handler->name, bprm); |
|
|
} |
|
|
ok: |
|
|
if (retval < 0) |
|
|
goto out; |
|
|
r.mode = ccs_check_flags(r.domain, CCS_TOMOYO_MAC_FOR_ENV); |
|
|
retval = check_environ(&r); |
|
|
if (retval < 0) |
|
|
goto out; |
|
|
retval = ccs_register_next_domain(r.domain); |
|
|
if (retval < 0) |
|
|
goto out; |
|
|
task->tomoyo_flags |= TOMOYO_CHECK_READ_FOR_OPEN_EXEC; |
|
|
retval = search_binary_handler(bprm, regs); |
|
|
task->tomoyo_flags &= ~TOMOYO_CHECK_READ_FOR_OPEN_EXEC; |
|
|
if (retval < 0) |
|
|
goto out; |
|
|
/* Proceed to next domain if execution suceeded. */ |
|
|
task->domain_info = r.domain; |
|
|
mb(); /* Make domain transition visible to other CPUs. */ |
|
|
/* Mark the current process as execute handler. */ |
|
|
if (handler) |
|
|
task->tomoyo_flags |= TOMOYO_TASK_IS_EXECUTE_HANDLER; |
|
|
/* Mark the current process as normal process. */ |
|
|
else |
|
|
task->tomoyo_flags &= ~TOMOYO_TASK_IS_EXECUTE_HANDLER; |
|
|
out: |
|
|
ccs_unregister_next_domain(); |
|
|
ccs_free(eh_path); |
|
|
ccs_free(tmp); |
|
1139 |
return retval; |
return retval; |
1140 |
} |
} |
1141 |
|
|
1142 |
#else |
void __init ccs_domain_init(void) |
|
|
|
|
/** |
|
|
* search_binary_handler_with_transition - Wrapper for search_binary_handler(). |
|
|
* |
|
|
* @bprm: Pointer to "struct linux_binprm". |
|
|
* @regs: Pointer to "struct pt_regs". |
|
|
* |
|
|
* Returns the result of search_binary_handler(). |
|
|
*/ |
|
|
int search_binary_handler_with_transition(struct linux_binprm *bprm, |
|
|
struct pt_regs *regs) |
|
1143 |
{ |
{ |
1144 |
#ifdef CONFIG_SAKURA |
ccsecurity_ops.search_binary_handler = __ccs_search_binary_handler; |
|
/* Clear manager flag. */ |
|
|
current->tomoyo_flags &= ~CCS_TASK_IS_POLICY_MANAGER; |
|
|
ccs_load_policy(bprm->filename); |
|
|
#endif |
|
|
return search_binary_handler(bprm, regs); |
|
1145 |
} |
} |
|
|
|
|
#endif |
|